A bag contain 8 red and 5 white balls. 2 balls are drawn at random. What is the probability that both are white?

Question

A bag contain 5 blue and 4 black balls. Three balls are drawn at random. What is the probability that 2 are blue and 1 is black.

Answer 1

n(S)=13C2=78
n(E)=5C2=10

Therefore
P(E)=n(E)/n(S)
=10/78
=5/39

Ans:Probability is 5/39

Answer 2

p(E)= 10/78

p(E)= 5c2 / 13c2 = 10/78

Answer 3

1 in 169... WAIT! it's... 1 in yeah