Two dice are tossed The probability that the total score is a prime number is ........

Quantitative Aptitude ( CCS) Probability

Two dice are tossed. The probability that the total score is a prime number is:

5/12

1/6

1/2

7/9

Clearly, n(S) = (6 x 6) = 36.

Let E = Event that the sum is a prime number.

Then E= { (1, 1), (1, 2), (1, 4), (1, 6), (2, 1), (2, 3), (2, 5), (3, 2), (3, 4), (4, 1), (4,3),(5, 2), (5, 6), (6, 1), (6, 5) }

n(E) = 15.

P(E) = n(E)/n(S) = 15/36 = 5/12.

Hence, option 1 is the correct answer.

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