[administration]

Q. A die is rolled until it shows a 4. What is the probability that the 6th trial is the final trial?

[Wonder Boy]

The probability of not getting a 4 in a throw = 5/6

The probability of getting a 4 in a throw  = 1/6

Now since result of each throw is not dependent on the result of previous throw.

so probability of getting a 4 in the 6th trial = (5/6)⁵ x 1/6

[Author]

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