pages of a report

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pages of a report

by sanju09 » Fri May 07, 2010 3:47 am
The pages of a report are numbered consecutively from 1 to 10. If the sum of the page numbers up to and including page number x of the report is equal to one more than the sum of the page numbers following page number x, then x =
(A) 3
(B) 4
(C) 5
(D) 6
(E) 7
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by liferocks » Fri May 07, 2010 4:00 am
Sum of page numbers from 1 to 10 is 55
Sum of page numbers from 1 to 7 is 28

sum of 8,9 1nd 10 is 27

hence ans option E
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