There are two bags. First contains 7 red and 5 violet balls whereas second contains 7 violet and 5 r

M4maths Previous Puzzles

01 Dec 2020 PROBABILITY

There are two bags. First contains 7 red and 5 violet balls whereas second contains 7 violet and 5 red balls. A ball is drawn at random from both the bags. Probability of both balls having same colour is

OPtion

1) 25/49
2) 35/144
3) 15/2
4) 35/7
5) 3/7
6) 37/25
7) 35/72
8) 1/9
9) 49/72
10) None of the above

Solution

(7/12)*(5/12) + (5/12)*(7/12) = 70/144 = 35/72

Correct Option: 7 Best Solution (3)