Probability that: two are white and one is blue

[Chikis]

A box contains identical balls of which 12 are red, 16 white and 8 blue. Three balls are drawn from the box one after the other without replacement. Find the probability that: two are white and one is blue.
Please I need working and explaination.

[Guest]

Total outcome = 12+16+8 = 36

Prob(Two are white and one is blue)
= P(WWB) or P(WBW) or P(BWW)
= (16/36*15/35*8/34) or (16/36*8/35*15/34) or (8/36*16/35*15/34)
=16/357 + 16/357 + 16/357
=16/119