A box contains 6 bottles of 1 drink, 3 bottles of variety 2 drink and 4 bottles of variety 3 drinks. Three bottles of them are drawn at random, what is the probability that the three are not of the same variety.
(Probability)Total bottles=6+3+4=13
Here, number of ways of taking 3 drink bottles out of 13==
Again, here event of taking 3 bottles of the same variety = Event of taking 3 bottles out of 6 or 3
bottles out of 3 or 3 bottles out of 4=
The probability of taking 3 bottles of the same variety =
Then probability of taking 3 bottles are not same variety = 1-