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Third number = (First number + Second number) X 2 (21, 15, 72) = (21 + 15) X 2 = 36 X 2 = 72. (27, 12, 78) = (27 + 12) X 2 = 39 X 2 = 78 (42, 32, 148) = (42 + 32) X 2 = 74 X 2 = 148. (28, 24, 104) = (28 + 24) X 2 = 52 X 2 = 104. (15, 12, 62) = (15 + 12) X 2 = 27 X 2 = 54 ≠ 62
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