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Aptitude | Probability | Question 7

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A bag contains 21 balls numbered 1 to 21. two balls are drawn one after another without replacement. Find the probability that both balls are even numbered. (A) 3/14 (B) 2/3 (C) 6/9 (D) 1/8

Answer: (A)

Explanation:

Total numbers in sample space is 21 Probability of choosing any two of them is 21C2. There are total 10 even numbers from 1 to 21 and probability of choosing any two of them is 10C2 Therefore the required answer is 10C2/21C2 = 3/14



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Last Updated : 16 Sep, 2021
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