Yes, because their only common factor is 1.
no first of all 16 is not a prime no so it can not fit for any prime no to be co prime
16 = 24 45 = 32 x 5 So 16 and 45 are co-prime
17 is a prime number but 68 is Composite.
Yes.
No.
Yes.
Yes.
As 17 is prime, it is coprime to any number The same thing stands also for 19 as 19 is also prime
1, since they are co-prime.
Because their GCF is 1.
1, 2, 4, 5, 8, 10, 11, 13, 16, 17, 19 and 20. The distinct prime factors of 21 are 3 and 7, so I removed multiples of them.
There's a lot of them. 5, 7, 13, 17 are all co-prime with that list.