Length based on prime factor

[bharatv]

For any positive integer n, the length of n is defined as the number of prime factors whose product is n. For example, the length of 75 is 3, since 75 = 3 x 5 x 5. How many two-digit positive integers have length 6?

a. none
b. one
c. two
d. three
e. four

Can any one explain on this please.?

[dumb.doofus]

I think there's jsut two 64 and 96 (post edited)

[bharatv]

The OA seems to be C(Two)

But how did you calculate. Is there a easy way to do this?

[scoobydooby]

figured out the other: 96

2^5*3=96

[dumb.doofus]

yeah missed out on this one.

I don't see a simpler way other than just checking it manually..