Wrong because 3/4 and a 1/4 are rational numbers that add up to 1
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The sum of any finite set of rational numbers is a rational number.
sometimes true (when the rational numbers are the same)
Because both of those numbers are rational. The sum of any two rational numbers is rational.
find the rational between1and3
Because a is rational, there exist integers m and n such that a=m/n. Because b is rational, there exist integers p and q such that b=p/q. Consider a+b. a+b=(m/n)+(p/q)=(mq/nq)+(pn/mq)=(mq+pn)/(nq). (mq+pn) is an integer because the product of two integers is an integer, and the sum of two integers is an integer. nq is an integer since the product of two integers is an integer. Because a+b equals the quotient of two integers, a+b is rational.