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28 December, 19:34

Which pair of numbers is relatively prime?

a. 7 and 42

b. 16 and 39

c. 66 and 77

d. 90 and 891 user: are 30 and 138 relatively prime numbers

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  1. 28 December, 19:55
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    "Relatively prime" means that the greatest common factor is one.

    Only b. satisfies that condition because 16=2*2*2*2 and 39=3*13

    So there are no common factors other than one.
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