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Let p be the probability of happeni...

Let p be the probability of happening of an event , and q of its non- happening then the total chance of r successes in n trials ` 0 le r le n , ` is

A

`""^(n )C_(r) .p^(r) . q^(n-r)`

B

`""^(n)C_(r).p^(r-1).q^(r+1)`

C

`""^(n)C_(r).P^(r+1).q^(r-1)`

D

`""^(n)C_(r).P^(r ).q^(r )`

Text Solution

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The correct Answer is:
A
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