In a certain test, a students gave wrong answers to at least `i` questions, where `i = 1, 2, ..., k`. No student gave more than `k` wrong answers. The total number of wrong answers given is

In a certain test,there are n question.In the test,2^(n-i) students gave wrong answers to at least i questions,where i=1,2,.........,n if the total number of wrong answers given is 2047, then n is equal to a.10 b.11 c.12 d.13

In a certain test, there are n questions. In this test, 2^(n-k) students gave wrong answers to atleast k questions, where k=1,2,3, . . ,. If the total number of wrong answers given in 127, then the value of n is

In a certain test, there are n questions. In this, 2^( n-r ) students gave wrong answers to at least (r) questions, where r=0,1,2,….n . If the total number of wrong answer is 4095, then the value of n is

In a management entrance test, a student scores 2 marks for every correct answer and loses 0.5 marks for every wrong answer. A student attempts all the 100 questions and scores 120 marks. The number of questions he answered correctly was (a)50 (b)45 (c)60 (d)68