Question
All the page numbers from a book are added, beginning at page 1. However, one page number was added twice by mistake. The sum obtained was 805. Which page number was added twice?
Answer: Option D
:
D
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:
D
−n(n+1)2=805;n(n+1)=1610, most appropriate value of n= 39.
39×402=780; Therefore,the page number that was counted twice is : 805 -780 =25.
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