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If D(m) + D(n) = 125, what is the value of m + n?

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I am thinking of two regular polygons. One polygon has m sides and D(m) diagonals, and the other has n sides and D(n) diagonals.

If D(m) + D(n) = 125, what is the value of m + n?

posted May 5, 2020 by Samardeep Acharya

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