单选题
What is the largest prime factor of 255?
(A)5
(B) 15
(C) 17
(D)51
(E)255
A
B
C
D
E
【正确答案】
C
【答案解析】
Test the choices starting with C: 255 is divisible by 17 (255 = 17 × 15), so this is a possible answer. Does 255 have a larger prime factor? Neither Choice D nor E is prime, so the answer must be Choice C.
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