Question

A box contains 10 red marbles, 20 blue marbles and 30 green marbles. 5 marbles are drawn from the box, what is the probability that all will be blue?

Answer 1

5 marbles are to be chosen from 60 (10red+20blue+30green)

hence

n(S) = 60C5

let A  be the event that all are blue

hence out of 20blue marbles 5 will be chosen

n(A) = 20C5

P(A) =n(A) / n(S)

= 20C5 / 60C5

Hope its helpfull brainliest please