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What is the value of sum (r=1) ^(n) (P (...

What is the value of `sum _(r=1) ^(n) (P ( n,r))/( r!) ` ?

A

(a) `2^(n)-1`

B

(b) `2^(n)`

C

(c) `2^(n) -1`

D

(d) `2^(n) +1`

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The correct Answer is:
A
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