Probability 1 Question 9

9. Four fair dice D1,D2,D3 and D4 each having six faces numbered 1, 2, 3, 4, 5 and 6 are rolled simultaneously. The probability that D4 shows a number appearing on one of D1,D2 and D3, is

(2012)

(a) 91216

(b) 108216

(c) 125216

(d) 127216

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Answer:

Correct Answer: 9. (a)

Solution:

  1. PLAN As one of the dice shows a number appearing on one of P1,P2 and P3.

Thus, the favourable number of cases =9787.

Required probability =9787157



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