Mark the correct alternative in the following:

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


Given:


P(selected coupon bears number 9)= p


p=9/15


= 3/5


P(selected coupon bears number 9) = p(all coupons bear number 9) – p( selected coupon bears number 8)


n=7


p(that all coupon bear number 9)


P(x=7)= 7C7 p7 q0


= p7



P(that the selected coupon bears number 9)


P= 8/15


P(x=7)= 7C7 p7 q0


= p7



Required probability

1