Lessons

General Aptitude
34.1 Probability - General Questions

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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 be the sample space and E be the 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 x 15C2)



= 1050.
P(E) = n(E)/n(S) = 1050/2300 = 21/46.  
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