Find b such that the equation 15x = b in Z24 has

a. More than one solution for x

b. No solution for x

Part a. Since im working in Z24 would I have more than one answer for part A.

I would guess the answer would be 8, 16, 24, 32

15(8) = 120 and in Z24 that equals 1

Part b. Not sure how to answer that