14
Question
Which of the following pairs of numbers are co-primes?
(1) 9, 12
(1) 9, 12
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Solution
The divisors of 9 are 1, 3 and 9.
The divisors of 12 are 1, 2, 3, 4, 6 and 12.
Because the numbers have more than one common divisor, they are not co-prime.
The divisors of 12 are 1, 2, 3, 4, 6 and 12.
Because the numbers have more than one common divisor, they are not co-prime.
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