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Question

Which pairs are not co-prime number?

A
22, 44
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B
13, 97
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C
175, 221
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D
73, 37.
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Solution

The correct option is A 22, 44
Two numbers are said to be co-prime numbers they have no common factor other than one.

(i) 44=2×22,22=22×1
22,44 have a common factor 22
So, 22,44 are not co-prime numbers

(ii) 13,97 have a common factor 1
So, 13,97 are co-prime numbers

(iii) 175,221 have a common factor 1
So, 175,221 are co-prime numbers

(iv) 73,37 have a common factor 1
So, 73,37 are co-prime numbers

Hence out of all options only Opt:[A] has the numbers that are not co-primes

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