A book was published in eight intervals .if total 8 books are published their sum is equal to 15504.Then what is the year first book was published ??

• x+(x+8)+(x+16)+(x+24)+(x+32)+(x+40)+(x+48)+(x+56) = 15304
  8x+224 = 15504
  8x = 15280
  x = 1910
  The 1st book was published in the year 1910.
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