₦airaland Forum

1. Cairo University, Giza, Egypt
2. Bayero University, Kano, Nigeria
3. University of Cape Town, South Africa
4. University of Ghana, Accra, Ghana


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mrphysics:
As I headed back, it was getting dark. I came back 9:35pm. Now, I have to revise some stuff ahead of my exam tomorrow. Good night.

I wish you the very best in your exams bro.

cc: adebayour26

LamaNewton:
my answer

wrong.. Let's see your workings please

Hhenryy:
You tried but you cannot cancel pi in the final solution. That is not mathematically correct.. You can either multiply through with 2pi or proceed to LCM, which will not simplify things either. So you can leave it at the penultimate step. It is correct to that level.

lol.. He got it wrong even before that last stage

NDSMELODY:
here is my solution

you're very wrong.. That your difference of 2 squares is wrong

Shibaraba:
Ask nicely. Rephrase how you asked
Since we are less busy. Take

square both sides
A^2=(PI*r)^2 (h^2-r^2)

divide both sides by PI^2

(A/PI)^2 -r^2h^2 +r^4=0 define a new variable, u=r^2

u^2-uh^2+(A/PI)^2=0 now use the quadratic formula

u=(h^2+-sqrt(h^4-4A^2/PI^2)/2

but u=r^2, so for r, take the square root of u above.
Note there are two solutions, life is not so simple in these equations

baba, you're wicked oo..

He can only get your explanation if he has an idea already

ferd88:
WhatsApp me 07035322092

why WhatsApp.. Solve it for him here so that others can also learn

kosmos95:
Please my Muslim brothers, am confused on what do woke up late this morning due to stress, forget to eat "sarri". Can I go ahead with the fasting or I will need to omit it and return it immediately after the whole fasting end. Bcoz heard one need to at least eat or drink water for "sarri" B4 he or she can get the fasting started for each day or is not compulsory that someone must taste something, please really need urgent help. Thanks

go ahead with your fast.. Still valid

Click HERE to download Oronsaye report

naturalwaves:
Lmao. She used term expected number in a group of 100 which points towards probability. If you need to get the number out of 100,just multiply the answer by 100. E. G if you have (1/4) =0.25
as a probability which means 1 out of every 4. If you now want to get the 1,you will need to multiply 4 by 0.25.So,multiply 100 by the answer to get the figure. You won't still get up to even 1. What does that say? It means that the probability that no 2 persons will share same birthday out of the 100 is negligible.

always proud of you. You're a good teacher. Keep it up bro!

Martinez39s:
Jackpot never mentioned anything about probability. How did probability get involved in the solution?

you can get your expected values from probability.. It is even simpler in this case since our N is 100

jackpot:
Read up birthday paradox: it says that among a group of 23 persons there's an approx. 50-50 chance that there's at least a shared birthday within the group. For example, in the 2014 world cup, 16 teams out of the 32 teams had at least 2 team members sharing a birthday. The paradox is strange but true.

Yes..

naturalwaves:
SOLUTION
We need to take a step by step approach in order to get this.
Since 29th of February is not included, this means that we are dealing with just 365 days.
Having said that, what is the expected probability of the 1st student? That is going to be 365/365 days
What is the expected probability of the 2nd student? 364/365
Third? 363/365
Fourth....362/365
Fifth..................361/365
This is how it will go on till we get to the 100th student which will be 266/365 but we cannot do this as it will be too cumbersome.
Now, let us sort the denominator. Every component in the denominator is 365 i.e 365/365 * 364/365 * 363/365................*266/365.
This means that the denominator will be 365¹⁰⁰.

How about the numerator? We have 365! but we are not going to be needing the whole of it. We only need the area from 365 to 266. How do we get this?
All we need do is to divide 365! by 265!.

Thus, the desired solution to the problem is;
(365!) / (265! * 365¹⁰⁰).

Modified:
So, I have gotten a calculator,
(365!) / (265! * 365¹⁰⁰). = 3.0725 * 10^-7 approximately.
That is around 0.00000030725 approx.
As you can see, the probability is very slim as it is almost unlikely that out of 100 students, none will share a birthday which makes a lot of sense.

cc: Jackpot, Dejt4u, Martinez39s, Mrshape, Richiez, mathefaro,ifada123

This is also one of the best advanced calculators available: https://keisan.casio.com/calculator

but in reality, this is not valid

Horlartunes:
A computer science graduate is much welcome
I need urgent help on maths, statistics and numerical mathematics analysis

You should resides in ibadan
Drop your whatsapp

present
What is the gig about

exynos:
MrShape
Dejt4u
Martinez39s

https://www.nairaland.com/1147658/nairaland-mathematics-clinic/265#88040967

Follow through.. The solution is there on page 266

naturalwaves:
SOLUTION
We need to take a step by step approach in order to get this.
Since 29th of February is not included, this means that we are dealing with just 365 days.
Having said that, what is the expected probability of the 1st student? That is going to be 365/365 days
What is the expected probability of the 2nd student? 364/365
Third? 363/365
Fourth....362/365
Fifth..................361/365
This is how it will go on till we get to the 100th student which will be 266/365 but we cannot do this as it will be too cumbersome.
Now, let us sort the denominator. Every component in the denominator is 365 i.e 365/365 * 364/365 * 363/365................*266/365.
This means that the denominator will be 365¹⁰⁰.

How about the numerator? We have 365! but we are not going to be needing the whole of it. We only need the area from 365 to 266. How do we get this?
All we need do is to divide 365! by 265!.

Thus, the desired solution to the problem is;
(365!) / (265! * 365¹⁰⁰.

I think I like this

Olalekanbanky1:
You are right... But special ops are trained to do dat. It could be possible mind you... Could u belive America has spies in armed forces of countries like Iran, N/Korea, Iraq and co? Those guys are trained to do such.

you're right

forever24:
Are you looking for a home mathematics lesson teacher for your children, you can call or WhatsApp me on 07084185633.
I am 100% available. Thanks

add location to your post

elimighty:
Thanks a lot for this enlightenment

you're welcome.. Kindly check my addendum above..

You can contact me if you need more info on radiation and health physics

dejt4u:
The best thing for you is to get a higher degree in physics (Masters)..
These are most lucrative areas of physics you can specialize on..

- Radiation and Health physics (slightly different from medical physics but closely related.. The only university offering true medical physics in Nigeria is Unilag).


- Solid earth physics (closely related to geophysics)

- Atmospheric physics (also related to ionospheric physics)

- Theoretical physics

- etc


That radiation and health physics is a hot cake with numerous relevance.. It is also very related to Nuclear physics.

Addendum: Radiation and Health physics has broad application than medical physics.
Medical physics is only restricted to medical application (Diagnostic radiology, radiotherapy and nuclear medicine)..

While radiation and health physics fits in all areas of radiation application (Medical, industrial (nuclear gauges, well logging, NDT, construction, nuclear reactors, radiation protection, etc)

elimighty:
4 years later, a Physics undergraduate is willing to know how far with those who commented above
Thanks in anticipation

The best thing for you is to get a higher degree in physics (Masters)..
These are most lucrative areas of physics you can specialize on..

- Radiation and Health physics (slightly different from medical physics but closely related.. The only university offering true medical physics in Nigeria is Unilag).


- Solid earth physics (closely related to geophysics)

- Atmospheric physics (also related to ionospheric physics)

- Theoretical physics

- etc


That radiation and health physics is a hot cake with numerous relevance.. It is also very related to Nuclear physics.

jackpot:
Among a group of 100 random students, what is the expected number of students who don't share birthdays with others in the group?

Note: by birthday, it means same month and day, and not necessarily year.


Assumptions: none of the students were born on February 29 and that number of days in a year is 365.

Mrshape, dejt4u, martinez39s, Richiez, mathefaro, naturalwaves, other mathematicians please help

N =100
P = 1 - (1/365) = 364/365

Expected value = N×P = 100 × (364/365) = 99.73

freemanbubble:
What is your conclusion and rating about this Chris Hemsworth movie tittled "extraction"
To me it is okay
The action scenes were dope
Not as predictable as every other action movies

What is your say?

I don't like the movie jare.. The story line is lame.. Too direct. You can narrate the whole movie in just 30 seconds. Lol

I wonder how a mortal man will last that long under those raining bullets.

bestabigaelever:
Cc: dejt4u

thanks for the mention.. I've been so busy today.
Let me check it out

dandydrey:
Leggo!

answer is 100..

Divide 40 by half = 40÷0.5= 80
Then add 20 = 80+20 = 100

red18sgfootball:
Can you solve the correct value of these images? �

Ease your boredom at home by helping us crack this simple solution. �

any prize attached? If yes, then i'ma solve it ASAP

I need motivation

Nelomma:

https://www.youtube.com/watch?v=ZAGyuBPNDiI
Good luck

coming

Lockdown will be lifted on 4th of May 2020