Question

There are 3 red, 5 blue and 2 yellow balls in a box. Two balls are drawn at random without replacing the first one. Find the probability that i) at least one is yellow ii) both of them are not red

Answer 1

Total number of balls = 3 red + 5 blue + 2 yellow ===> 10 balls

Two balls randomly drawn out from a box without replacing the 1st one

(i i) Event :- Both of them are not red

Probability that both are not red P = p( E ) / n (s)

7/10