Question

A book contains 3 white balls 4 black balls and 5 yellow balls in how msny ways can 4 ball be drawn from the box. If at least one yellow ball is to be include draw..

Answer 1

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нσρє ιт нєℓρє∂ уσυ...


∂єαя мαтє,


ι ωιℓℓ αℓωαуѕ нєℓρ уσυ


F͙ O͙ L͙ L͙ O͙ W. ͙ M͙ E͙


and мarĸ B͙ R͙ A͙ I͙ N͙ L͙ I͙ E͙ S͙ T͙

Answer 2

let 3 white ball be w1, w2 ,w3, 4 black ball be B1, B2, B3, B4, and 5 yellow be Y1, Y2, Y3, Y4, Y5.
hence n(s) =12
n(a) =4
p(a) =n(a) /n(s)
p(a) =4/12
hence P(a) = 1/3