Arithmetic Ability
 Probability

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Q.

In a class, there are 15 boys and 10 girls. Three students are selected at random. The probability that 1 girl and 2 boys are selected, is:

View Answer

Correct choice: A

Explanation:

Let , S - sample space E - event of selecting 1 girl and 2 boys. Then, n(S) = Number ways of selecting 3 students out of 25 = 25C3 = 2300. n(E) = 10C1×15C2 = 1050. P(E) = n(E)/n(s) = 1050/2300 = 21/46
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