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