Explanation:
Exp: B
(18, 25)
Two numbers are said to be co-prime
If the HCF between them is 1
14 = 2 × 7
35 = 5 × 7
HCF(14, 35) = 7
18 = 2 × 3 × 3
25 = 5 × 5
HCF(18, 25) = 1
31 = 1 × 31
93 = 3 × 31
HCF(31, 93) = 31
32 = 2 × 2 × 2 × 2 × 2
62 = 2 × 31
HCF(32, 62) = 2
Since the HCF(18, 25) is 1, 18 and 25 is the pair of co-primes.
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Medium **[Real Numbers]**