Jenn randomly chooses a number J from 1, 2, 3, ....., 19, 20. Bela then randomly chooses a number B from 1, 2, 3, ....., 19, 20 distinct from J. The value of B - Jis
m n at least 2 with a probability that can be expressed in the form V
n are relatively prime positive integers. Find m + n.