... imaginary ones. :D
Because they're multiplying to a big number like 63, in order to add to one, they'll need a positive and a negative to get big like the "63" but sum small to the 1.
However, the product's going to be imaginary.
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1 x 63, 3 x 21, 7 x 9, 9 x 7, 21 x 3, 63 x 1
There are no two real numbers that add to 2 and multiply together to get 2. Using complex numbers, (1 + i) and (1 - i) add to 2 and multiply together to get 2.
Two numbers that multiply to give -1 are -1 and 1.
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1 x 63, 3 x 21, 7 x 9
1 x 63, 3 x 21, 7 x 9
1 x 63, 3 x 21, 7 x 9
You can multiply 1: by 63.
1, 3, 7, 9, 21 and 63: 1 x 63, 3 x 21, 7 x 9
1 x 63, 3 x 21, 7 x 9
1 x 63, 3 x 21, 7 x 9, 9 x 7, 21 x 3, 63 x 1
1 x 63, 3 x 21, 7 x 9, 9 x 7, 21 x 3, 63 x 1
1 x 63, 3 x 21, 7 x 9, 9 x 7, 21 x 3, 63 x 1.