Question:
Which one of the following is a pair of co-prime numbers?
Which one of the following is a pair of co-prime numbers?
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Co-prime numbers need not both be prime; they only require no common factors other than 1.
Updated On: Nov 6, 2025
- (14, 35)
- (18, 25)
- (31, 93)
- (32, 62)
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The Correct Option is B
Solution and Explanation
Step 1: Definition of co-prime numbers.
Two numbers are co-prime if their HCF is 1 (i.e., they have no common factor other than 1).
Step 2: Find HCF of each pair.
(14, 35) → HCF = 7
(18, 25) → HCF = 1
(31, 93) → HCF = 31
(32, 62) → HCF = 2
Step 3: Identify the co-prime pair.
Only (18, 25) has HCF = 1.
Step 4: Final answer.
Therefore, (18, 25) is a co-prime pair.
Two numbers are co-prime if their HCF is 1 (i.e., they have no common factor other than 1).
Step 2: Find HCF of each pair.
(14, 35) → HCF = 7
(18, 25) → HCF = 1
(31, 93) → HCF = 31
(32, 62) → HCF = 2
Step 3: Identify the co-prime pair.
Only (18, 25) has HCF = 1.
Step 4: Final answer.
Therefore, (18, 25) is a co-prime pair.
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