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Q.

Which of the following is co-prime numbers?


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a

25,14

b

18,16

c

9,18

d

11,77  

answer is A.

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Detailed Solution

Given pairs are 25 and 14, 18 and 16, 9 and 18 and 11 and 77.
To find which of these numbers are co-prime numbers.
The two numbers which have only 1 as their common factor are called co-primes.
Out of the given pair of numbers,
Factors of 25 are 1,5,25.
Factors of 14 are 1,2,7,14.
Their common factor is 1.
Hence 25,14 are co-prime numbers.
While other options has common factors other than 1.
For option (2)  the common factor is 2.
For option (3)  the common factor is 3.
For option (4)  the common factor is 11.
Hence, the correct option is 1.
 
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