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What is the value of the integer r ?

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What is the value of the integer r ? [#permalink]

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New post 02 Aug 2017, 23:32
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Question Stats:

70% (00:47) correct 30% (00:43) wrong based on 47 sessions

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What is the value of the integer r ?

(1) The only prime factors of r are 3 and 7.
(2) Each of the integers 3, 7, and 21 are factors of r.
[Reveal] Spoiler: OA

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Re: What is the value of the integer r ? [#permalink]

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New post 03 Aug 2017, 03:12
Statement 1: since 3 and 7 are the only prime factors of an integer the only integer is 21 which has 3 and 7 as only prime factors
Sufficient

Statement 2: stated that 7, 3 and 21 are the factors of r it isn't only it could have 4,5,6 etc as many factors so
Insufficient

Ans: A

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Re: What is the value of the integer r ? [#permalink]

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New post 03 Aug 2017, 04:08
arif24 wrote:
Statement 1: since 3 and 7 are the only prime factors of an integer the only integer is 21 which has 3 and 7 as only prime factors
Sufficient

Statement 2: stated that 7, 3 and 21 are the factors of r it isn't only it could have 4,5,6 etc as many factors so
Insufficient

Ans: A

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But 63 (21*3) also has 3 and 7 as only two prime factors isnt it?

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Re: What is the value of the integer r ? [#permalink]

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New post 03 Aug 2017, 04:11
pannchan wrote:
arif24 wrote:
Statement 1: since 3 and 7 are the only prime factors of an integer the only integer is 21 which has 3 and 7 as only prime factors
Sufficient

Statement 2: stated that 7, 3 and 21 are the factors of r it isn't only it could have 4,5,6 etc as many factors so
Insufficient

Ans: A

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But 63 (21*3) also has 3 and 7 as only two prime factors isnt it?

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Thanks for pointing out the mistake
Ans :E

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Last edited by arif24 on 03 Aug 2017, 04:16, edited 2 times in total.

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Re: What is the value of the integer r ? [#permalink]

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New post 03 Aug 2017, 04:12
E

Statement 1: 21 with its multiples of 3 or 7 is possible. Insufficient.

Statement 2: Problem with statement 1 still stands.

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Re: What is the value of the integer r ?   [#permalink] 03 Aug 2017, 04:12
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What is the value of the integer r ?

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