6 runners, 3 medals, how many ways to give them? well, runner say 2 could get gold or not, bronze or not and silver or not, and so can any other runnner, and the order "does matter", it makes a distinction, thus, is a Permutation
A conic section whose focus is at the pole has the equation r=2/1+cosθ . Which of the following equations is the directrix of th
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