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

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

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New post 25 Jan 2018, 07:17
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A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

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

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

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New post 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 \(\frac{(20 - 8)}{20}\) = \(\frac{3}{5}\)

Answer must be (E)

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Abhishek....

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

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