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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
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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