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Anonymous
Wiki User
Any number can be multiplied by 21
How about: 3*7 = 21 or 1*21 = 21
21 multiplies to 21 to make it 441
21*5 is the answer
1 x 21, 3 x 7
21
21*6=126
2*21 = 42
21 and 5
2 when multiplied by 21 = 42
57
1, 3, 7, 21: 1 x 21, 3 x 7