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I want to know whether the "number of prime factors" the same with "number of different prime factors".
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I would say it doesn't. If it's phrased as "number of prime factors" then i think based on other questions i've seen it means how many prime factors it has. So my answer would be C.
the only thing different between 300 and 500 is the prime factors 3 and 5. other than that, both have 100 so the number of prime factors of 100 is the same for both.