A box of colored crayons contains 9 distinct colors. In how many ways can 2 colors be chosen, assuming that the order of the col
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For E to be the midpoint of DF, it needs to divide DF in 2 equal segments, DE and EF. If E is the midpoint of DF, then DE and EF are equal, so the reason is that the expressions for DE and EF are equal. The reason is: