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Four materials (A, B, C, D) have approximately equal melting points. All possible combinations of two of the four solids were prepared by combining equal amounts of each solid. The melting points of three of the mixtures are shown below. What melting points (approximately) would you expect for the other three mixtures? Please explain.
A + B: 81 - 83
°C A + C: 66 - 76 °C A + D: 81 - 83 °C
B + C: B + D: C + D:

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