Question

A bag contains 3 red, 7 white and 4 black balls. if three balls are drawn from the bag, then what is the probability that all of them are of the same colour

Answer 1

the probability that all are of same colour may 3,7,4
total possibilities are14
p(e)= n(e)/ n(s)
=3/14&7/14&4/14
=3/14&1/2&4/14