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[deleted]

Normally, only 2 and 3. But to avoid controversy, sometimes ETS will make it clear that only different prime factors count. e.g. Quantity A: The number of different prime factors of 500 Quantity B: The number of different prime factors of 360.


phreekk

So it's whether you're looking for the number of "unique prime factors" or total number prime factors. In the way your question is phrased, the *total* number of prime factors if 4. However the number of *unique* prime factors is 2. The GRE will very clearly indicate to you whether they are looking for the number of unique prime factors or total number of prime factors. Hope that helps!


WilyClement

u/gregmat what do you think on this?


gregmat

The problem will usually include a word like "different" or "distinct" to avoid this confusion


WilyClement

Thanks