In a bag there are 10 red and 15 blue marbles. Two marbles are drawn in succession without replaceme

M4maths Previous Puzzles

06 May 2021 PROBABILITY

In a bag there are 10 red and 15 blue marbles. Two marbles are drawn in succession without replacement. What is the probability that first is red and second is blue

OPtion

1) 1/2
2) 5/8
3) 2/5
4) 3/4
5) 1/4
6) 1/6
7) 2/7
8) 3/8
9) 2/9
10) None of these

Solution

Probability that first one is red = 10/25 = 2/5
Probability that second one is blue = 15/24 = 5/8
probability that first is red and second is blue = 2/5 * 5/8 = 1/4

Correct Option: 5 Best Solution (3)