Fifteen coupons are numbered 1,2 ..... 15 , respectively. Seven coupons are selected at random one at a timewith replacement. The probability that the largest number appearing on a selected coupon is 9 , is
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a
9166
b
8157
c
357
d
None of these
answer is C.
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Detailed Solution
n=7 Prob. of getting any no. out 1,2,3,…9 is p=9/15q=6 / 5P(x=7)=7C7p7q0 [Binomialdistribution]=9157=357