Which of the following number pairs is NOT co-prime?
(143, 286)
Two numbers are co-prime if their HCF is 1.
(137, 221): 137 is prime and does not divide 221 = 13 × 17, so HCF = 1 → co-prime.
(101, 107): both are prime → co-prime.
(143, 286): 286 = 2 × 143, so HCF = 143 ≠ 1 → NOT co-prime.
(211, 337): both are prime → co-prime.
Hence, the answer is (143, 286).
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