a) total ways of drawing any 4
= 12c4 = 495
b)
= 462/495
a) from a to of 12 flatres, 4 are selected at random. if the lot contains 4 defective flares (flares that wilt fire), what is the probability that all 4 will not work?
B) what is the probability that at most 2 will not work?
1 answer