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# A teacher prepares 20 chits, each chit having a unique integer out of

Author Message
Current Student
Joined: 27 May 2014
Posts: 524
GMAT 1: 730 Q49 V41
A teacher prepares 20 chits, each chit having a unique integer out of  [#permalink]

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25 Jan 2018, 07:17
00:00

Difficulty:

35% (medium)

Question Stats:

59% (00:58) correct 41% (00:46) wrong based on 22 sessions

### HideShow timer Statistics

A teacher prepares 20 chits, each chit having a unique integer out of the first 20 positive integers. A student is asked to draw a chit at random. What is the probability that the chit drawn by the student does not have a prime number?

A) 7/20
B) 2/5
C) 9/20
D) 11/20
E) 3/5

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Re: A teacher prepares 20 chits, each chit having a unique integer out of  [#permalink]

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25 Jan 2018, 07:42
saswata4s wrote:
A teacher prepares 20 chits, each chit having a unique integer out of the first 20 positive integers. A student is asked to draw a chit at random. What is the probability that the chit drawn by the student does not have a prime number?

A) 7/20
B) 2/5
C) 9/20
D) 11/20
E) 3/5

Possible Prime numbers less than 20 are - 2,3,5,7,11,13,17 & 19

So, Required Probability will be $$\frac{(20 - 8)}{20}$$ = $$\frac{3}{5}$$

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THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

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

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Abhishek....

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Re: A teacher prepares 20 chits, each chit having a unique integer out of &nbs [#permalink] 25 Jan 2018, 07:42
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