BrittanyLovesYou
How many diagonals does a quadrilateral have?
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brandonkramer
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FoolForMath
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FoolForMath
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In general \[\frac{n(n3)}{2} \]

atjari
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dw:1331315455752:dw
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BrittanyLovesYou
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thanks ;)))

atjari
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yw

siddhantsharan
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You can infact derieve that result FoolForMath gave using Combinatrix.