a batch of 25 used automobile alternators contains 3 defectives. if 3 alternators are sampled at random, find the probability of the event .
(a). A=[none of the defectives appear ]
(b). B=[exactly two defectives appear]
A) 0.6696
B)
(a). A=[none of the defectives appear ]
(b). B=[exactly two defectives appear]
B)