Notice that most of the problems haveshort, easy and elegant
solutions, since you've noticed a trick/trap hidden in the
questions.
1. There are 5 pairs of white, 3 pairs of black and 2 pairs of
grey socks in a drawer. If four socks are picked at random what is
the probability of getting two socks of the same color?A. 1/5B.
2/5C. 3/4D. 4/5E. 1
No formula is need to answer this one. The trick here is that we
have only 3 different color socks but we pick 4 socks, which
ensures that in ANY case we'll have at least one pair of the same
color (if 3 socks we pick are of the different color, then the 4th
sock must match with either of previously picked one). P=1.
