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A box contains 6 red and 4 white balls. If 3 balls are drawn at random, the probability of getting 2 white balls without replacement is …

(a) 1/20

(b) 18/25

(c) 4/25

(d) 3/10

1 Answer

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Best answer

(d) 3/10

Total number of balls = 10 

Number of ways of choosing 3 balls from 10 balls 

= 10C3

Number of ways of choosing 2 white balls from 4 white balls = 4C3 

Number of ways of choosing 1 red ball from 6 red balls = 6C1

Probability of getting 2 white balls and 1 red ball 

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