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If a and b are both prime integers, which of the following could not

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If a and b are both prime integers, which of the following could not  [#permalink]

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New post 04 Apr 2018, 22:13
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A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

51% (02:19) correct 49% (00:47) wrong based on 95 sessions

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Re: If a and b are both prime integers, which of the following could not  [#permalink]

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New post 04 Apr 2018, 22:35
Bunuel wrote:
If a and b are both prime integers, which of the following could not be the product of a and b?

A. 14
B. 102
C. 133
D. 142
E. 237


Checking from options:102=3*2*13
Option B.
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Re: If a and b are both prime integers, which of the following could not  [#permalink]

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New post 10 Apr 2018, 11:13
Bunuel wrote:
If a and b are both prime integers, which of the following could not be the product of a and b?

A. 14
B. 102
C. 133
D. 142
E. 237


Since 14 = 2 x 7, 133 = 7 x 19, 142 = 2 x 71, 237 = 3 x 79, only 102 cannot be the product of two prime numbers.

Answer: B
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If a and b are both prime integers, which of the following could not  [#permalink]

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New post 15 Apr 2018, 12:29
Bunuel wrote:
If a and b are both prime integers, which of the following could not be the product of a and b?

A. 14
B. 102
C. 133
D. 142
E. 237


Do Prime Factorization and find which answer will have more than 2 prime factors.

102 --> 2x51 --> 2x3x17. This is 3 factors, so you can not have AB=102 while A and B are both Prime numbers.

Answer: B
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If a and b are both prime integers, which of the following could not &nbs [#permalink] 15 Apr 2018, 12:29
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