Question

Which of the following pair of numbers is a coprime?
a) 5 and 15
b) 21 and 27 c) 7 and 42 d) 12 and 17
Which of the following pair of numbers are twin primes?
b) 13 and 15 c) 31 and 33
d) 41 and 43
a) 8 and 9
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Answer 1

Answer:

1 is co_prime

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Answer 2

Answer:

5and15

21and27

7and42

12and17