# A bag contains 4 white,5 red6 blue balls.3 balls are drawn randomly from a bag, the probability of getting all the three red is?

total number of balls = 4+5+6 = 15 balls
out of 15 balls , the number of ways of choosing 3 balls is equal to the number of sample space.
number of sample space =

the number of ways of choosing 3 red balls =

the probability of getting all the three red balls $=\frac{10}{455}=\frac{2}{91}$

hope this helps you

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