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Anonymous
3 x 3 x 7 = 63
3 x 3 x 3 x 7 = 189
3 x 3 x 7 x 7 = 441
Wiki User
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32 x 72 = 441
32*72 = 441
441 = 3 x 3 x 7 x 7
289 does.
√441 = √(3^2 × 7^2) = 3 × 7.