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# An urn

Author Message
Manager
Joined: 19 Oct 2016
Posts: 72
Location: India
Schools: IIMA (I)
GMAT 1: 580 Q46 V24
GMAT 2: 540 Q39 V25
GMAT 3: 660 Q48 V34
GPA: 3.15
WE: Psychology and Counseling (Health Care)

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14 Feb 2017, 23:29
00:00

Difficulty:

(N/A)

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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Intern
Joined: 11 Jan 2017
Posts: 1

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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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