Question

Q.11 A box contains 5 green, 4 yellow and 3 white
balk. Three balls are drawn at random. What is the
probability that they are not of same colour?​

Answer 1

Answer:

So, Probability of getting Green or Yellow or White ball = (60/1320) + (24/1320) + (6/1320) = 9/132 = 3/44. Ans: 41/44. ARIEN3228 wrote: A box contains 5 green, 4 yellow and 3 white marbles.

Step-by-step explanation:

Answer 2

Step-by-step explanation:

Let's find the probability that three drawn marble are of the same color and subtract that from 1.

P(three marbles are NOT of the same color) = 1 - P(three marbles are of the same color) =

= 1- (P(all three are green) + P(all three are yellow) + P(all three are white)) =

$= 1 - ( \frac{5c3}{12c3} + \frac{4c3}{12c3} + \frac{3c3}{12c3} ) \\ = 1 - ( \frac{10}{220} + \frac{4}{220 } + \frac{1}{220} ) \\ \\ = \frac{41}{44}$