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Anonymous
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7 x 3
How about: 3*7 = 21 or 1*21 = 21
1, 3, 7, 9, 21 and 63: 1 x 63, 3 x 21, 7 x 9
1, 3, 7, 21: 1 x 21, 3 x 7
What you do is multiply all 3 numbers together.