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A pair of dice is thrown 5 times. For each throw, a total of 5 is considered a success. If the probability of at least 4 successes is k/311 ,then k is equal to 

(1) 82 

(2) 123 

(3) 164 

(4) 75

1 Answer

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Best answer

Correct option is (2) 123

Probability of success = 1/9 = p 

Probability of failure q = 8/9

P(at least 4 success) = P (4 success) + P (5 success)

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