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A series of book was published at 7 seven year intervals. When the seventh book was published the total some of publication year was 13,524. First book was published in??
Q.) Some time, work, wages questions was also there.
Read Solution (Total 7)
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- sum of A.P ->Sn=n/2(2a+(n-1)d)
where Sn=13524(given),n=7,d=7
13524=7/2(2*a+(7-1)7)
a=1911 - 12 years agoHelpfull: Yes(30) No(0)
- x+(x+7)+(x+14)+-----+(x+42)
=7x+7(1+2+----6)
=7x+7*21
so 7(x+21)=13524 - 12 years agoHelpfull: Yes(7) No(4)
- 13524/7=1932(median)--d year 4th book was published
now for d first book, deduce 7*3=21 yrs, will get 1911. - 12 years agoHelpfull: Yes(5) No(0)
- i think 1911
bcoz x+x+7+x+14+x+21+x+28+x+35+x+42=13524
x=1911 - 12 years agoHelpfull: Yes(3) No(0)
- 1911 is correct answer
- 12 years agoHelpfull: Yes(2) No(0)
- ans is 1911
let the yar when 1st book was published is x
x+x+7+x+14+x+21+x+28+x+35x+42=13542 - 12 years agoHelpfull: Yes(2) No(0)
- 1911...simple a.p
- 12 years agoHelpfull: Yes(1) No(2)
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