find the power set of the following set

Question

A = (prime factors of 210)

Answer 1

lets look at the prime factors of 210

2,3,5,7

So there must be 2^4 members of the power set, or 16 elements, including the empty set.

Power set: 2, 3, 5, 7, (2,3), (2,5), (2,7), (3,5), (3,7), (5,7), (2,3,5), (2,3,7), (2,5,7), (3,5,7), (2,3,5,7), (empty set)

Check that. Are there more?

Answer 2

can you explain how 2,3,5,7

are prime factor of 210