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12 December, 19:44

Seven ping-pong balls numbered 1-7 are put in a hat. Three balls are chosen without replacement. What is the probability that all three numbers are even numbers?

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  1. 12 December, 20:31
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    Probability of 1st number being even : 3/7

    probability of 2nd number being even : 2/6

    probability of 3rd number being even : 1/5

    probability of all 3 numbers being even : 3/7 * 2/6 * 1/5 = 6/210 = 1/35
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