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Question: In a box, there are 2 red, 3 black and 4 white balls. Out of these three balls are drawn together. T...

In a box, there are 2 red, 3 black and 4 white balls. Out of these three balls are drawn together. The probability of these being of same colour is -

A

1/84

B

1/21

C

5/84

D

None of these

Answer

5/84

Explanation

Solution

Req. Prof = 3C3+4C39C3=584\frac { { } ^ { 3 } \mathrm { C } _ { 3 } + { } ^ { 4 } \mathrm { C } _ { 3 } } { { } ^ { 9 } \mathrm { C } _ { 3 } } = \frac { 5 } { 84 }