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Question
Which of the following are co-primes?
Options
91 and 72
34 and 51
21 and 36
15 and 20
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Solution
The correct option is 91 and 72.
The H.C.F. of 72 and 91 is 1.
So, they are co-primes.
Option 34 and 51 is not correct because 34 and 51 have 17 as their H.C.F.
Option 21 and 36 is not correct because 21 and 56 have 3 as their H.C.F.
Option 15 and 20 is not correct because 15 and 20 have 5 as their H.C.F.
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