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Hi, I can help get you started. The houses with the gray siding are houses numbered 2, 7, 12, 17 and so on. The houses with the stone chimneys are houses numbered 11, 14, 17 and so on. Notice that house number 17 has gray siding and a stone chimney. From then on every 5th house has gray siding end every 3rd house has a gray chimney. Since $3 \times 5 = 15$ every 15th house will have both. Penny | ||||||||||||
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