ANSWERS: 2
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Three or four.
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42 is 6*7 which is 2*3*7 and those are all prime. Just keep factorizing until each number is prime. 55 is 5*11 and both of those are prime. Multiply them together and you will get 2*3*5*7*11 (It's lucky that there were no repeated prime factors. How many prime factors are in 4 for instance? One or two?)
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