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An urn

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Manager
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Joined: 19 Oct 2016
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Location: India
Concentration: Marketing, Leadership
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GMAT 1: 580 Q46 V24
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WE: Psychology and Counseling (Health Care)
An urn  [#permalink]

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New post 14 Feb 2017, 23:29
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A
B
C
D
E

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Question Stats:

50% (00:00) correct 50% (00:00) wrong based on 4 sessions

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An urn contains only black marbles, green marbles, and red marbles, all identical except for color. If the total number of marbles in the urn is 15, what is the probability of drawing a black or red marble when a single marble is drawn at random from the urn?

1. The number of red marbles is 2.

2. The number of green marbles is 5.

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Re: An urn  [#permalink]

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New post 14 Feb 2017, 23:37
If we consider the 2nd data given, no. of green marbles =5.
so the remaining 10 out of 15 must be black and red marbles.
that gives us the probability of drawing a black or a red marble from the urn as : 10/15 = 2/3.

So, the answer is option B

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Re: An urn &nbs [#permalink] 14 Feb 2017, 23:37
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