CMAT 2018 Solved Question Paper

Question : 21 of 100

Marks: +1, -0

In a box there are eight yellow and four black balls. If three balls are drawn at random, what is the probability that two are yellow and one black ?

Solution:

Probability of two yellow and one black balls is
=

{^8c_2 × ^4c_1}/{^12c_3}

{{8!}/{6! × 2!} × {4!}/{1! × 3!}}/{{12!}/{9! × 3!}

{28 × 4 × 6}/{12 × 11 × 10}

{28}/{55}

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