two balls are drawn from a bag containing 5 white balls and 7 black balls. find the probability that both are white
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Step-by-step explanation:
bag contains 5 white balls and 7 black balls = total 12 balls
no. of ways of drawing 2 white balls from 5 white balls
= 5c2 ---A
no. of ways of drawing 2 balls from 12 balls
= 12c2 ---B
probability of drawing 2 white balls =A/B
= 5c2 / 12c2=5×4/12×11 =5/33
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