Both 35 and 39 are composite numbers,the only factor common between them is 1.
∴ 35 and 39 are co-prime numbers.
Some more examples are : 1) 2,3 ; 2) 3,4 3) 5,6 4) 8,13, and so on. Twin Primes : Two prime number are known as twin primes of there is only one composite number between them.
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