Q. 175.0( 1 Vote )

Mark the correct A.

B.

C.

D. none of these

Answer :

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

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