Question

In.a examination candidate to pass in 4diffrent subjects .in how many ways he can fail

Answer 1

No. of ways in which one can pass or fail in the examination (m)=2

4 =1624=16

To pass one has to pass in all the subjects (n)=1 way

Hence, the no. of ways in which one can fail=(m−n)

=16−1 =15ways

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