Latest IBM Aptitude Question SOLUTION: A series of book was published at seven years intervals when the seventh book was published the total sum of publication year was 13, 1524. first book was published in?

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A series of book was published at seven years intervals when the seventh book was published the total sum of publication year was 13, 1524. first book was published in?

Asked In IBM Sachin Barkade (7 years ago)

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Shubha Sarkar  (7 years ago)

First of all total sum of publication years is 13524 not 131524.
Let the first year is x.
so the years are x, x+7, x+14, x+21, x+28, x+35 and x+42.
Now Sum of all years = (n/2)(2a+(n-1)d) [n=number of years, a=first year, d=difference of two years]
=(7/2)(2x+(7-1)7)
=7x+147
Again Sum of all years = 13524
So, 7x+147=13524
=> x=1911

Is this solution Helpfull? Yes (21) | No (2)  

skk  (7 years ago)

Hey Any one got venue details and exam date about IBM referrral drive for associate system engineer..

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raja  (7 years ago)

let the 1st year be x and each book is published at the interval of 7 years and no of books are 7. so last book will be published on (x+42) yrs
as
sum=n/2 (a+l)
where n=no of books
a=x (as we have assumed)
l= x+42
putting these values
7/2 (x+x+42)=13524 (not 131524)
x=1911

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suvasree chatterjee  (7 years ago)

I got referal for IBM plz suggest me smtng how to prepare for ibm xm this is my first attempt and i dont kno how many rounds ill be there.

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