There are 100 students in a class. 20 students are failed in chemistry whereas 3 are failed in mat

M4maths Previous Puzzles

18 Dec 2010 Probability?

There are 100 students in a class. 20 students are failed in chemistry whereas 3 are failed in mathematics and chemistry .
What will be the probability that any student failed in chemistry would also be failed in mathematics?

OPtion

1) 1/5
2) 3/100
3) 3/20
4) 3/5
5) 23/100
6) 3/10
7) 1/15
8) 4/13
9) 1/100
10) 3/2000

Solution

Required probability = p (M∩C)/p (M) = 3/20

Correct Option: 3 Best Solution (6)