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A pair of dice is true through independently 3 times. the probability of getting score of 9 exactly twice isA.1/729B.8/9C.8/728C.8/243

A pair of dice is true through independently 3 times. the probability of getting score of 9 exactly twice isA.1/729B.8/9C.8/728C.8/243

Grade:12th pass

1 Answers

Arun
25757 Points
4 years ago
Dear Akash
To get a sum of 9, prob = 4/36 = 1/9
p = 1/9
q = 8/9
Now
Use binomial distribution
n = 3
r =2
Prob = nCr (p)^r q^(n-r)
Regards
Arun (askIITians forum expert)

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