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A drawer contains a mixture of 12 black socks, 8 white socks, and 4 red socks. You randomly select 2 socks to wear.
Determine the probability that you pick a matching pair. (Give your answer as a fraction.)
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Successive outcomes:
1) 2 black socks of 12: = = 66;
2) 2 white socks of 8: = = 28;
3) 2 red socks of 4: = = 6.
The total space of outcomes: = = = 12*23.
Answer. . Please calculate it on your own.