Out of 26, 13 and 34, which two numbers are co-prime?

Check common factors (GCD):

• 26 and 13 → 13 divides 26
  👉 GCD = 13 ❌ Not co-prime

• 34 and 26 → Both are even
  👉 Common factor = 2 ❌ Not co-prime

• 13 and 34 →
  13 is prime and does not divide 34
  👉 GCD = 1 ✅ Co-prime

✅ Answer: 13 and 34