A series of book was published at seven year intervals. When the seventh book was published the total sum of publication year was 13, 524. First book was published in?
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time= 7years
total sum=13524
fish book will be published in=total sum÷time
13524÷7
1932 is your answer
total sum=13524
fish book will be published in=total sum÷time
13524÷7
1932 is your answer
Answered by
10
Answer:
the years at which books are published are terms of AP where
let first term a be x;
common difference (d) =7
number of terms(n)=7
sum of seven terms(S7)=13524
n/2[2a+(n-1)d]=13524
7/2[2x+6(7)]=13524
2x+6(7)=3864
x=1911
therefore the first book was published in 1911
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