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A rational number is one that can be expressed as a ratio of two integers, a/b (where b is non-zero).
No.
297
7 9/10
No. It is divisible by 7. 7*7 = 49
3 x 3 x 7 = 63
126
4402898141
No
East India Company game serial numder
20
7632229161
3145371969
dividend
no one knows
21
The numder is 666