Question

    type-ssc

    In an examination of 5 subjects, it is mandatory for a

    student to pass in each subject. In how many ways can she fail?
    A 41 Correct Answer Incorrect Answer
    B 31 Correct Answer Incorrect Answer
    C 63 Correct Answer Incorrect Answer
    D 45 Correct Answer Incorrect Answer

    Solution

     A student can fail only when he is failing in at least one subject. Therefore, will fail in the following ways. Failing in 1 subject or 2 subjects or 3 subjects or 4 subjects or 5 subjects. Total number of ways = 5C1 +5C2 +5C3 +5C4+5C5 =25-1 =32-1=31

    Practice Next

    Relevant for Exams: