A) 8
B) 9
C) 16
D) none of these
Correct Answer: B
Solution :
[b] There is concept of derangement. The require number is \[4!\left[ 1-\frac{1}{1!}+\frac{1}{2!}-\frac{1}{3!}+\frac{1}{4!} \right]=9\]You need to login to perform this action.
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