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Fifteen coupons are numbered 1 to 15. Seven coupons are selected at random, one at a time with replacement. The probability that the largest number appearing on a selected coupon be 9 is?

Asked by laks78 | 13 May, 2019, 11:37: PM
Expert Answer
Total number of ways = 157
According to the question we must select 7 coupons numbered from 1 to 9 such that 9 is selected at least once.
Total number of favourable ways = 97 - 87
Required probability = (97 - 87)/157
Answered by Renu Varma | 14 May, 2019, 10:16: AM
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