There are N questions in an exam.For i= 1, 2,..... N ,there are 2N-1 s – McqOptions

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1.	There are N questions in an exam.For i= 1, 2,..... N ,there are 2N-1 students who answered i or more questions wrongly. If total number of wrong answers is 8191, N then will be
A.	13
B.	10
C.	11
D.	12
Answer» B. 10

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