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Question: A box contains 6 red and 4 blue balls. Two balls are drawn without replacement. The second ball draw...

A box contains 6 red and 4 blue balls. Two balls are drawn without replacement. The second ball drawn is red’ has probability p/q. (p and q are co-prime), then value of p + q is -

A

10

B

8

C

5

D

4

Answer

8

Explanation

Solution

p = 610×59+410×69=35\frac { 6 } { 10 } \times \frac { 5 } { 9 } + \frac { 4 } { 10 } \times \frac { 6 } { 9 } = \frac { 3 } { 5 }