Q. 175.0( 1 Vote )

Mark the correct A.



D. none of these

Answer :


P(selected coupon bears number 9)= p


= 3/5

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


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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