10 identical six-sided dice are thrown simultaneously. What is the probability of all 6 faces appearing?
Solution;
Suppose an experiment of throwing a dice.The sample space S is given by\
S = {1,2,3,4,5,6}
No.of elements in S are 6
probability of 6 = 1/6
Here , 10 dice are thrown.
n = 10 (No. of trials)
Let a r.v. X denotes the of 6 faces out of these 10
X follows binomial(n = 10 , p = 1/6)
The PMF of binomial is given by
P(X = x) = (n C x) * px * (1 - p)n - x
Here, p = 1/6 and 1 - p = 1 - (1/6) = 5/6
Find P(all are 6)
= P(X = 10)
= (10C 10) * (1/6)10 * (5/6)10-10
= (10C 10) * (1/6)10 * (5/6)0
= 0.0000
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