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.

• 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
• 11 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
• 11 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.
• 11 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
• 11 years agoHelpfull: Yes(3) No(0)
• 1911 is correct answer
• 11 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
• 11 years agoHelpfull: Yes(2) No(0)
• 1911...simple a.p
• 11 years agoHelpfull: Yes(1) No(2)