TS ICET 23 May 2018 Shift 2 Paper

Question : 148 of 200

Marks: +1, -0

Two unbiased six faced dice are rolled. The probability of getting a sum which is a prime number is

$1/12$
$5/12$
$7/12$
$11/12$

Solution:

Total outcomes

= 6 × 6 = 36

Favourable outcomes = {(1, 1), (2, 1), (1, 2), (1, 4), (2, 3), (3, 2), (4, 1), (1, 6), (2, 5), (3, 4), (4, 3), (5, 2), (6, 1), (5, 6), (6, 5)} = 15.
Required probability

=15/36=5/12

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