Question: 8. A computer program generates numbers between 1 and 18, a) what is the probability that the number 5 will not appear until 7th number.

8. A computer program generates numbers between 1 and 18, a) what is the probability that the number 5 will not appear until 7th number. [2K] b) what is the expected number of trials until 18 appears? [1K]
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