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# Of the students in a certain class, 10 had taken a course in

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Manager
Joined: 30 Jul 2014
Posts: 137
GPA: 3.72
Re: Of the students in a certain class, 10 had taken a course in  [#permalink]

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22 May 2017, 04:27
There are two type of formula we need to understand - I applied the first one, skipping "exactly 2" from the consideration. Second, I assumed that A+B+C = 20, hence got the wrong answer. The correct answer should be A.
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Re: Of the students in a certain class, 10 had taken a course in  [#permalink]

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02 Jun 2018, 10:24
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Of the students in a certain class, 10 had taken a course in &nbs [#permalink] 02 Jun 2018, 10:24

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