Four bits are transmitted over a digital communications channel. each bit is either distorted or received without distortion. let ai denote the event that the ith bit is distorted, i , , =… 14 . (a) describe the sample space for this experiment. (b) are the ai’s mutually exclusive? describe the outcomes in each of the following events: (c) a1 (d) a1′ (e) 1234 ∩∩∩ (f) a a a