Arturo O. answered 05/22/20
Experienced Physics Teacher for Physics Tutoring
Between 1 and 19, the multiples of 3 are
3,6,9,12,15,18
That is 6 multiples of 3, so there are 6 chances in 19 of pulling a multiple of 3. The probability is
6/19 = 0.316 = 31.6%