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Q: What is the smallest number having four different prime factors?

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1155

The smallest prime factors are 2,3,5,7 thus the smallest number would be the product of these will be 210

12

24

I think that it is 4

Logically, the smallest number with 4 different prime factors would have to be the product of the smallest four prime numbers. So the smallest natural number with four different prime factors is 210 (2*3*5*7).

36

Six

How about: 105

1155

36

60

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