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If n things are arranged in a row, the n...

If n things are arranged in a row, the number of way in which they can be arranged so that non occupies its original position is `n!(1-(1)/(1!)+(1)/(2!)-(1)/(3!)+* * * + (-1)^(n)(1)/(n!))`
Five boys are to be seated in a row. The number of ways in which 3 boys are not seated in the place specfied to them is

A

`""^(5)P_(2)`

B

10

C

40

D

25

Text Solution

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The correct Answer is:
A
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