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Which of the following is co-prime numbers?

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25, 14

18, 16

9, 18

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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