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Fifteen coupons are numbered 1, 2, 3,…, ...

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

A

`9^7-8^7`

B

`10^7-8^7`

C

`8^7-7^7`

D

None of these

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