GMAT Problem Solving (PS) | Of the 20 members of a kitchen crew, 17 can use the meat-cutting machi

Of the 20 members of a kitchen crew, 17 can use the meat-cutting machine, 18 can use the bread-slicing machine, and 15 can use both machines. If one member is chosen at random, what is the probability that the member chosen will be someone who cannot use either machine?

a) 0

b) 1/10

c) 1/7

d) 1/4

e) 1/3