Which of the following numbers has the largest number of unique prime factors?: {573, 951, 825, 639}

1 Answer
sente
Apr 29, 2016

825=3*5^2*11

Explanation:

573 = 3*191
951 = 3*317
825=3*5^2*11
639 = 3^2*71

As seen above, all of 573, 951, and 639 have two distinct prime factors, whereas 825 has three.

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