An infinite number of solutions exist. A rational number just means it can be expressed as a whole number, decimal, or fraction. So you could have 1/2 X 2 or 1/3 X 3 or 2/3 X 3/2 or 1.5 X (2/3). Or of course you could have 1 X 1. Or if you like you can use two negative numbers, like -1 X -1 or -1/2 X -2.
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Yes.2 and 0.5 are both rational. But 2^0.5, which is sqrt(2), is irrational.
The way in which the binary functions, addition and multiplication, are defined on the set of rational numbers ensures that the set is closed under these two operations.
Uhh... okay then... 500 and 2.
11*27 = 297
The sum of two rational numbers is rational.From there, it follows that the sum of a finite set of rational numbers is also rational.