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In a class of 30 students, there are 17 girls and 13 boys. [#permalink]

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24 Oct 2008, 14:16

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In a class of 30 students, there are 17 girls and 13 boys. Five are A students, and three of these students are girls. If a student is chosen at random, what is the probability of choosing a girl or an A student?

A. 19/30 B. 11/15 C. 17/180 D. None of the above.

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In a class of 30 students, there are 17 girls and 13 boys. Five are A students, and three of these students are girls. If a student is chosen at random, what is the probability of choosing a girl or an A student?

A. 19/30 B. 11/15 C. 17/180 D. None of the above.

B. The Probability of choosing a girl is 17/30. The probability of choosing an A student is 5/30 The P(girl) + the P(A student) = 17/30 + 5/30 = 22/30 = 11/15.

In a class of 30 students, there are 17 girls and 13 boys. Five are A students, and three of these students are girls. If a student is chosen at random, what is the probability of choosing a girl or an A student?

A. 19/30 B. 11/15 C. 17/180 D. None of the above.

I think 17/30 + 2/30 = 19/30

2/30 is because 17/30 includes all the girls (including A girls)

P (girl or A students ) = P (girl) + p ( A student) - P ( girl and A student) Hence it is 17/30 + 5/30 - 3/30 = 19/30

Thanks, icandy. I think you are right.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.