₦airaland Forum

afo7219:
Next question pls

MrOlai:
What is the formula for the nth term of the sequence:

-1, 5, 15, 29, 47, ...?

MrOlai:
Wrong. It isn't AP.

DrayZee:
You're asking for the formula use to find the value of different terns in a sequence.
Sequences and Series..arithmetic progression...It's all related.

Now, gimme the answer to that question...or better still,tell me why my answer is not correct.

DrayZee:
Lol. The one above is AP na.

MrOlai:
AP has a common difference. In the sequence -1, 5, 15, 29, 47, .... , there is no common difference there. So, it's not an AP.

DrayZee:
You're asking for the formula use to find the value of different terns in a sequence.
Sequences and Series..arithmetic progression...It's all related.

Now, gimme the answer to that question...or better still,tell me why my answer is not correct.

DrayZee:
T_n= 2(n-1)²+4(n-1) -1

MrOlai:
According to your formula, when n =1, you wouldn't get -1.

DrayZee:
Lol. Check again.

MrOlai:
You're very correct!

I didn't observe your formula very well. Kudos!

But the sequence is not an AP.

DrayZee:
T_n= 2(n-1)²+4(n-1) -1

mustapha112:
Tn=2(n-1)^2+4(n-1)-1 2(n-1) (n-1)+4(n-1)-1 2[n^2-n-n+1]+4n-4-1 2n^2-2n-2n+2+4n-4-1 collect like terms 2n^2-2n-2n+4n+2-4-1 2n^2-4n+4n+2-4-1 2n^2+2-4-1 2n^2+2-5 Tn= 2n^2-3 final answer

MrOlai:
What about this:

T_n= 2n² - 3

mustapha112:
Sir i need a recharge card because of my account is low but i know that you are not giving but all my hardwork need to rewarded thank you,any amount i will appreciate.

mustapha112:
No but i am using mtn

MrOlai:
Ok

afo7219:
next question sir. Even if u no give me recharge card I no mind

mustapha112:
Sir,where is it i had not seen anything?

afo7219:
No of people 21

MrOlai:
On an Air France flight, there are 9 boys, 5 French children, 9 men, 7 foreign boys, 14 French citizens, 6 French males, and 7 foreign females. What is the number of people aboard the plane?

MasterMind21:
33

mustapha112:
What i am using is mtn,where will i find etisalat but you gave someone airtel sir please is there no alternative.

MrOlai:
Correct!