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Question
Which of the following numbers is co-prime?
17 and 68
Solution
Factors of 17 = 1, 17
Factors of 68 = 1, 2, 4, 17, 34, 68
We know that two numbers whose common factor is only 1 are called co-prime numbers.
The common factors of 17 and 68 are 1 and 17.
That is, it has two common factors, hence these are not co-prime numbers.
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