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10 identical six-sided dice are thrown simultaneously. What is the probability of all 6 faces appearing?

10 identical six-sided dice are thrown simultaneously. What is the probability of all 6 faces appearing?

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Answer #1

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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