What's cot(-180)
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Before the first straw is drawn, there are three short straws and 
straws in all. Thus, the probability of drawing a short straw first is 
.
After a short straw is drawn, there are two short straws and twelve total straws, a probability of
.
Thus, the probability of both of these events occurring is
.
After a short straw is drawn, there are two short straws and twelve total straws, a probability of
Thus, the probability of both of these events occurring is