Question

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

Answer 1

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.