Answer :

The co-prime number is the number which has only one common factor (i.e. 1) no other common factor.

Factor of 231 = 1 × 3 × 7 × 11

Factor of 396 = 1 × 2 × 2 × 3 × 3 × 11

Here, the common factor = 1, 3 and 11

Hence the number 231 and 396 are not co-prime.

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