There are 5 black, 5 blue, 5 red and 5 green T-shirts and all T-shirts of same colours are same in all aspects. What is the probability of selecting 5 T-shirts of 2 colours only?

There are 5 black, 5 blue, 5 red and 5 green T-shirts and all T-shirts

1.	There are 5 black, 5 blue, 5 red and 5 green T-shirts and all T-shirts of same colours are same in all aspects. What is the probability of selecting 5 T-shirts of 2 colours only?
A.	3 7
B.	2 7
C.	1 7
D.	5 7
E.	None of these
Answer» B. 2 7

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There are 5 black, 5 blue, 5 red and 5 green T-shirts and all T-shirts of same colours are same in all aspects. What is the probability of selecting 5 T-shirts of 2 colours only?

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