1.

Fifteen coupons are numbered 1,2,. . . . 15 respectively seven coupons are selected at random one at time withreplacement. The probabilitythat thelargest number appearingon a selected coupons is 9 is

Answer»

`((9)/(16))^(6)`
`((8)/(15))^(7)`
`((3)/(5))^(7)`
`(9^(7) - 8^(7))/(15^(7))`

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