Solve.A polygon with n sides has D diagonals, where D is given by the function D(n) = 
. Find the number of sides n if 77 ? D ? 170.
A. {n|15 ? n ? 20}
B. {n|14 ? n ? 20}
C. {n|13 ? n ? 21}
D. {n|12 ? n ? 21}
Answer: B
Mathematics
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