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

[BTGModeratorVI]

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

[Brent@GMATPrepNow]

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

Cheers,
Brent