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Pair the days so each pair makes 13: 1 + 12, 2 + 11, 3 + 10 and so on. There are 6 pairs, and 6 x 13 = 78.
Answer guide
Pair the days so each pair makes 13: 1 + 12, 2 + 11, 3 + 10 and so on. There are 6 pairs, and 6 x 13 = 78.
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