Suppose a local transportation authority has a fleet consisting of 100 buses, 10 of them are electric-driven, 60 of them are traditional internal combustion engine-driven, and the rest of them are driven by hybrid sources (both electricity and internal combustion engine). If five buses are randomly selected from the fleet, find the probability that

(a) one is electric-driven, two are internal combustion engine-driven.

(b) all five buses are driven by internal combustion engine.

(c) all five buses are electric-driven.