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Fifteen coupens are numbered 1,2,3,...15...

Fifteen coupens are numbered `1,2,3,...15` respectively. Seven coupons are selected at random one at a time with replacement The Probability that the largest number appearing on a selected coupon is 9 is :

Text Solution

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1,2,3,4,5,6,7,8,9
`=9^7-8^7`
`P=(9^7-8^7)/15^7`
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