Which of the following numbers has the largest number of unique prime factors?: {1024, 36, 75, 70, 42}

1 Answer
George C.
May 3, 2016

Both 70 and 42 have 3 unique prime factors.

Explanation:

  • 1024 = 2^10
  • 36 = 2^2*3^2
  • 75 = 3*5^2
  • 70 = 2*5*7
  • 42 = 2*3*7

So 70 and 42 have the largest number of unique prime factors, having 3 each.

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