According to the colligative properties of solutions, the more particles present in a solution, the lower its freezing point.
In this case, we have three solutions: $0.5 \mathrm{m}$ glucose, $0.5 \mathrm{m} \mathrm{NaCl},$ and $0.5 \mathrm{m} \mathrm{CaCl}_{2}
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