Ok we spent like literally 1 day on permutaions and combinations and I'm not really clear on it and I'm hoping someone can help me see the exact process that is going on when there is the combination of the 2 in the same problem. An example would be say there are 6 black socks, 4 blue socks, and 7 brown socks in a drawer, what is the probability that you will pull out 2 of the same color (without looking of course).
Here is how I have tried solving it but I am unsure if this is correct.
C(6,2) +C(4,2) +C(7,2) =
15 + 6 + 21 = 42/P(17,2) =
42/272 = 15.4% chance
is this correct and if not what is the correct procedure to follow.
Here is how I have tried solving it but I am unsure if this is correct.
C(6,2) +C(4,2) +C(7,2) =
15 + 6 + 21 = 42/P(17,2) =
42/272 = 15.4% chance
is this correct and if not what is the correct procedure to follow.