Which of the following is a pair of co-primes?
- (23, 92)
- (21, 35)
- (12, 28)
- (18, 25)
Explanation
Co-primes (or relatively prime numbers) are pairs of numbers whose greatest common divisor (GCD) is 1.
Let's check the GCD for each pair:
(23, 92): GCD = 23 (not co-prime).
(21, 35): GCD = 7 (not co-prime).
(12, 28): GCD = 4 (not co-prime).
(18, 25): GCD = 1 (they are co-prime).
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