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A box contains 5 green, 4 yellow and 3 white balls. Three balls are drawn at random. What is the probability that they are not of same colour.

A. 5255

B. 355

C. 4144

D. 344

Correct Answer :

C. 4144


Total cases =c312
=12×11×103×2×1=220
Total cases of drawing same colour =c35+c34+c33
5×42×1+4+1=15
Probability of same colur ==15220=344
Probability of not same colur =1344
=4144