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You Go For A Job Interview And They Ask You This - Jobs/Vacancies - Nairaland

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You Go For A Job Interview And They Ask You This by Cortana2: 6:22pm On Nov 26, 2016
You've almost nailed a job and then the interviewer placed on your table a white paper containing the following...

Legend has it that the inventor of the game called chess was told to name his own reward. His reply was along this lines.

Imagine a chess board.

Suppose one grain of corn is placed on the first square.
2 grains on the second
4 grains on the third,
8 grains on the fourth,

and so on until you get to the 64th square.

I would like as many grains of corn as the chess board now carries.

We were given just 5 minutes to do this... angry

2 Likes 3 Shares

Re: You Go For A Job Interview And They Ask You This by Emmaesty(f): 7:17pm On Nov 26, 2016
And at the end, they will offer you 40k

Some employers sha

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Re: You Go For A Job Interview And They Ask You This by Cortana2: 8:43pm On Nov 26, 2016
Emmaesty:
And at the end, they will offer you 40k

Some employers sha

40k? This is not one of those jobs.

1 Like 1 Share

Re: You Go For A Job Interview And They Ask You This by Ifeshyne(f): 6:06pm On Nov 28, 2016
This is a geometric progression (g.p) with ratio = 2, a = 1 (first number) and n = 64.
we use formula for sum of a geometric progression which is s = a(1-r^n)/1-r


After substituting the values, Final answer has to be in standard form if calculators are not allowed
Something like 2^64 - 1 or even just 2^64

121 Likes 6 Shares

Re: You Go For A Job Interview And They Ask You This by pinkyruledworld(m): 7:35pm On Nov 28, 2016
I dont even understand

37 Likes 1 Share

Re: You Go For A Job Interview And They Ask You This by H2Ossss(m): 7:48pm On Nov 28, 2016
Ifeshyne:
This is a geometric progression (g.p) with ratio = 2, a = 1 (first number) and n = 64.
we use formula for sum of a geometric progression which is s = a(1-r^n)/1-r


After substituting the values, Final answer has to be in standard form if calculators are not allowed
Something like 2^64 - 1 or even just 2^64

U go school.... This is simply application of what u learnt in school in a real life situation.

40 Likes 1 Share

Re: You Go For A Job Interview And They Ask You This by ekanDamie: 9:37pm On Nov 28, 2016
128 coins

9 Likes

Re: You Go For A Job Interview And They Ask You This by sirusX(m): 10:01pm On Nov 28, 2016
Ifeshyne:
This is a geometric progression (g.p) with ratio = 2, a = 1 (first number) and n = 64.
we use formula for sum of a geometric progression which is s = a(1-r^n)/1-r


After substituting the values, Final answer has to be in standard form if calculators are not allowed
Something like 2^64 - 1 or even just 2^64
Your head is soo in there.

OP...give her the job sharperly cheesy

13 Likes

Re: You Go For A Job Interview And They Ask You This by Jaii(m): 10:19pm On Nov 28, 2016
Ifeshyne:
This is a geometric progression (g.p) with ratio = 2, a = 1 (first number) and n = 64.
we use formula for sum of a geometric progression which is s = a(1-r^n)/1-r


After substituting the values, Final answer has to be in standard form if calculators are not allowed
Something like 2^64 - 1 or even just 2^64
ds chick deserves d job, not d o.p cheesy

19 Likes 1 Share

Re: You Go For A Job Interview And They Ask You This by agrovick(m): 10:47pm On Nov 28, 2016
All you should have done is raise 2 to a power of 63 judging by the trend set with the information given

5 Likes 1 Share

Re: You Go For A Job Interview And They Ask You This by Dinny1(m): 11:02pm On Nov 28, 2016
Brilliant Minds ...
Re: You Go For A Job Interview And They Ask You This by dejt4u(m): 6:17am On Nov 29, 2016
agrovick:
All you should have done is raise 2 to a power of 63 judging by the trend set with the information given
you are wrong.. It is (2^64) - 1 which is different from 2^(64-1)

my answer;
you definitely need a formula.. This is a GP series of the form 1, 2, 4, 8, 16, 32,...

From the above,
first term, a = 1, common ratio, r = 2,
supply this in the formula of sum of nth term of a GP..
Sn = a(rn - 1)/(r-1) since r > 1

therefore, S64 = 1(264 - 1)/(2-1),
S64 = 264 - 1

18 Likes

Re: You Go For A Job Interview And They Ask You This by Zirah: 7:10am On Nov 29, 2016
There's nothing wrong about it. 2 to the power of 63 is correct and you don't need any formula to get this solved smiley

dejt4u:
you are wrong.. It is (2^64) - 1 which is different from 2^(64-1)

2 Likes

Re: You Go For A Job Interview And They Ask You This by Nobody: 8:00am On Nov 29, 2016
What's with the whole interest in corns and grains? If I were you, I would have asked the recruiter if he was a fowl in his previous life. undecided


lastmumu

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Re: You Go For A Job Interview And They Ask You This by Raphafire101: 8:16am On Nov 29, 2016
Na wa ohhh..i hate calculations ehhhh.....

3 Likes

Re: You Go For A Job Interview And They Ask You This by Ifeshyne(f): 8:53am On Nov 29, 2016
H2Ossss:


U go school.... This is simply application of what u learnt in school in a real life situation.
Lool, hi!

1 Like

Re: You Go For A Job Interview And They Ask You This by tompat86(m): 9:18am On Nov 29, 2016
Ifeshyne:
This is a geometric progression (g.p) with ratio = 2, a = 1 (first number) and n = 64.
we use formula for sum of a geometric progression which is s = a(1-r^n)/1-r


After substituting the values, Final answer has to be in standard form if calculators are not allowed
Something like 2^64 - 1 or even just 2^64
Nice one,but hope u knw that 2「63 is not the final answer,since the person said d whole grains which d board can carry....it means that,u gonna add all d grains from the 1st box-the 64th box....mind u 2「63,is the total numbers of grains on the 64th box....they want u to add up from 2「0 through 2「63....
Which is pure madness,i will tell them that i dont want to imagine again.

13 Likes

Re: You Go For A Job Interview And They Ask You This by agrovick(m): 9:28am On Nov 29, 2016
dejt4u:
you are wrong.. It is (2^64) - 1 which is different from 2^(64-1)

Let me break it down a bit, 2 is the common factor (don't ask me how, I only took an informed guess)
1st square = 2^1-1 = 2^0 = 1
2nd square= 2^2-1 = 2^1 = 2
3rd square = 2^3-1 = 2^2 = 4
4th square = 2^4-1 = 2^3 = 8
64th = 2^64-1 = 2^63

LastMumu:
What's with the whole interest in corns and grains? If I were you, I would have asked the recruiter if he was a fowl in his previous life. undecided

Rotfl! You are one nairalander I will love to meet in person

22 Likes 3 Shares

Re: You Go For A Job Interview And They Ask You This by tompat86(m): 9:45am On Nov 29, 2016
agrovick:


Let me break it down a bit, 2 is the common factor (don't ask me how, I only took an informed guess)
1st square = 2^1-1 = 2^0 = 1
2nd square= 2^2-1 = 2^1 = 2
3rd square = 2^3-1 = 2^2 = 4
4th square = 2^4-1 = 2^3 = 8
64th = 2^64-1 = 2^63


Rotfl! You are one nairalander I will love to meet in person
Now they want u to addup from 2「1-1 through 2「64-1
Which is The total number of grains which the board can carry.

3 Likes 1 Share

Re: You Go For A Job Interview And They Ask You This by agrovick(m): 9:55am On Nov 29, 2016
tompat86:
Now they want u to addup from 2「1-1 through 2「64-1 Which is The total number of grains which the board can carry.
You are right, I missed that part. Will this format be correct
2^0 + 2^1 + 2^2 + 2^3... +2^63

4 Likes

Re: You Go For A Job Interview And They Ask You This by tompat86(m): 10:19am On Nov 29, 2016
agrovick:


You are right, I missed that part. Will this format be correct

2^0 + 2^1 + 2^2 + 2^3... +2^63
Yes Boss
And they expect u to solve it in 5mins,for a 30k job... angry grin

5 Likes

Re: You Go For A Job Interview And They Ask You This by Icecomrade: 10:41am On Nov 29, 2016
I just hate mathematics.

It is just there to test IQ, nothing more.

hiss

10 Likes

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