Question

21. An urn contains 9 red, 7 black and 5 white balls. If three balls are
drawn one after the other without replacement find the probability
that they are red, black and white respectively.
3/76

Answer 1

Step-by-step explanation:

Total no. of balls = 9+7+5 = 21

PE of red balls = 9/21 = 3/7

PE of black balls = 7/21 = 1/3

PE of white balls = 5/21

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Answer 2

hey bro i give your ans

first of all know the type of questions

this is a question of one after one without replacement

so probablity is

get red 9/21

get black 7/20

get white 5/19

multiple it

9×7×5 / 21×20×19

3/76

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