Factors go in pairs; prime factors are listed least to greatest.
2, 3 and 11
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The prime factors of 66 are: 2 3 11
420 has four prime factors. Prime factors don't usually travel in pairs.
The prime factors of 66 are: 2, 3 and 11
2 is prime, its only factors are one and itself.
The factors of 35 are: 1 5 7 35 The prime factors are: 5, 7