Q. 81

# Eight coins are tossed together. The probability of getting exactly 3 heads is

A.

B.

C.

D.

_{Correct}

Answer :

We know, probability distribution P(X=r)=^{n}C_{r} (p)^{r} q^{n-r}

Here. Total number coin is tossed, n =

The probability of getting head, p =1/2

The probability of getting tail, q = 1/2

Required probability = ^{8}C_{3}

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