Gate2017 ss Q1

0. There are 3 red socks, 4 green socks and 3 blue socks.You choose 2 socks. The probability that they are of the same colour is.

Answer
Comment
Array

Option : D
Explanation :
Now we can solved by:
Ways to collect both Red = ³C₂
Ways to collect both Green = ⁴C₂
Ways to collect both Blue = ³C₂
Total Ways = ¹⁰C₂
P(Socks of Same Colour) = (³C₂ + ⁴C₂+ ³C₂ ) / ¹⁰C₂ = 4/15

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