Which of the following are co-primes?

(a) 8,10
(b) 9,10
(c) 6,8
(d) 15,18

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Solution

(b) 9, 10
9 = 3 ×3 × 1
10 = 2 × 5 × 1
Though both 9 and 10 are composite numbers, the only factor common to them is 1.
Therefore, 9 and 10 are co-primes.

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