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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

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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

A test has 150 questions. A candidate gets 2 marks for each correct answer and loses 1 mark for each wrong answer and loses (1)/(2) mark for leaving the question unattempted. A student score 165 marks. If the student left 18 questions unattempted, find the number of questions he marked wrong.

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