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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