CAT 2001 Question 28

Question 28

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 1000. Which page number was added twice?

Solution

If the number of pages is 44, the sum will be 44*45/2 = 22*45 = 990
So, the number 10 was added twice



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