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)=nCr (p)r qn-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 = 8C3
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