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A series of book was published at 7 year intervals.When the 7th book was issued the sum of publication year is 13524.When was the 1st book published ?
Read Solution (Total 12)
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- sol:
sum of A.P. series=(n/2)(2*a+(n-1)*d)
here sum=13524,n=7,d=7 substituting these values in above eq. n solving we get
a=1911
which was the 1st book published year. - 12 years agoHelpfull: Yes(79) No(5)
- x+x+7+x+14+x+21+x+28+x+35+x+42=13524
x=1911 - 12 years agoHelpfull: Yes(39) No(3)
- yes.dis is simple AP series ans is 1911
- 12 years agoHelpfull: Yes(10) No(2)
- 1911,13542/7 =1932
1932 is d year when 4th book published
1st book published in year 1911 - 12 years agoHelpfull: Yes(9) No(4)
- take 7 position
_ _ _ _ _ _ _
mid one is 13524/7=1932
1st one should be 1932-21=1911 - 10 years agoHelpfull: Yes(5) No(0)
- 1911...simple AP SERIES
- 12 years agoHelpfull: Yes(2) No(4)
- it is given that series at 7 intervals,
therefor starting with ,assume 'x'
x+(x+7)+(x+14)+(x+21)+(x+28)+(x+35)+(x+42)=13,524
hence x=1911 - 9 years agoHelpfull: Yes(2) No(1)
- this is a dummy question . we get more than 1 answer !!!
- 9 years agoHelpfull: Yes(1) No(8)
- let us sum of the numbers formula,
let a be the 1st year,
7yrs is the difference b/n book to book.so,common difference is 7.
sum of the numbers=13524
so,Sn=n/2(a+(n-1)d) formula
13524=(7/2)(a+6*7), by solving this
a=3822 - 12 years agoHelpfull: Yes(0) No(22)
- the A.P series is like this,
x+(x+7)+(x+14)+(x+21)+(x+28)+(x+35)+(x+42)=13,524
simply use the formula of Sn , Sn=(n/2)*(a+l) ..... [here,a=first term =x,l=last term=x+42]
by solving this we will get x=1911(ANS) - 7 years agoHelpfull: Yes(0) No(0)
- sol:
Sn=(n/2)(2*a+(n-1)*d)
here sum=13524,n=7,d=7.therefore after solving we get-
a=1911 - 3 years agoHelpfull: Yes(0) No(0)
- A series of books was published at 7 year interval. So the difference among each book is same, i.e., we solve it by A.P series.
Sum of A.P = n/2(2*a+(n-1)*d)
by solving we get a=1911 - 3 years agoHelpfull: Yes(0) No(0)
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