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![[Post New]](/templates/default/images/icon_minipost_new.gif) 16 Oct 2007 09:08:04 IST
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Total no. of wrong answers = [i=1] [i=n] 2n-i
= 2n-1 + 2n-2 + 2n-3 + ....... + 22 + 21 + 20
= 2n - 1 (sum of GP)
Given : 2n - 1 = 2047
2n = 2048
2n = 211
n = 11
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Bipin Kumar Dubey
Chemical Dept.
IIT Kharagpur
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this reply: 5 points
(with 1 
in 1 votes ) [?]
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