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What is the sum of the unique prime factors of 207?

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Re: What is the sum of the unique prime factors of 207?

by Brent@GMATPrepNow » Sun May 17, 2020 8:12 am

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BTGModeratorVI wrote: ↑
Sat May 16, 2020 7:26 am
 What is the sum of the unique prime factors of 207?

(A) 23
(B) 26
(C) 29
(D) 69
(E) 207

Answer: B
Source: Magoosh
The key word here is unique

207 = (3)(3)(23)
So there are two UNIQUE prime factors: 3 and 23

3 + 23 = 26

Answer: B

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Brent
Brent Hanneson - Creator of GMATPrepNow.com
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