2:2

2:2 simplifies to 1:1 (or simply 1).

How: gcd(2,2) = 2, divide both terms by 2 → 2/2 : 2/2 = 1:1.

General rule: for a:b, divide both by gcd(a,b). If gcd(a,b) = 1, it's already in simplest form.

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