NCHMCT JEE 2016 Question Paper with solutions for online practice

Question : 49 of 200

Marks: +1, -0

Two dices are tossed. What is the probability that the total score is a prime number?

1/6
5/12
1/2
7/9

Solution:

E → Event of getting total scores as Prime Numbers
i.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
n(S) = 6 × 6 = 36
P (E) =

{n(E)}/{n(S)}

{15}/{36}

5/{12}

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