Question

What must be true about a/b
if c/d
and ad+bc/bd
are both rational numbers? Enter 1 for option 1 and 2 for option 2.

Option 1: ab
is rational

Option 2: ab
is irrationa

Answer 1

1

Reason: (ad+bc)/bd = a/b + c/d. If c/d and that sum are rational, their difference a/b is rational.