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# The “primeness” of a positive integer x is defined as the positive

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Manager
Joined: 18 Jan 2017
Posts: 128
The “primeness” of a positive integer x is defined as the positive  [#permalink]

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25 Jul 2017, 12:46
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1
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Difficulty:

5% (low)

Question Stats:

88% (00:52) correct 12% (01:01) wrong based on 48 sessions

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The “primeness” of a positive integer x is defined as the positive difference between its largest and smallest prime factors. Which of the following has the greatest primeness?

A) 10
B) 12
C) 14
D) 15
E) 18

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Manager
Joined: 23 May 2017
Posts: 239
Concentration: Finance, Accounting
WE: Programming (Energy and Utilities)
Re: The “primeness” of a positive integer x is defined as the positive  [#permalink]

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25 Jul 2017, 12:57
1
A) 10 = 5 * 2 = 5 - 2 = 3
B) 12 = 2*2*3 = 3 -2 = 1
C) 14 = 7 * 2 = 7 - 2 = 5 ===> largest
D) 15 = 5 * 3 = 5 - 3 = 2
E) 18 = 2*3*3 = 3 - 2 = 1
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Re: The “primeness” of a positive integer x is defined as the positive   [#permalink] 25 Jul 2017, 12:57
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# The “primeness” of a positive integer x is defined as the positive

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