How many numbers up to 100 are co-prime to 19 and how?Please explain.
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Numbers co-prime to 19 upto 100 = all 100 numbers - Numbers which are not multiple of 19 including 1 and itself.
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19 is a prime number. So it doesnt have any factOrs except 1 and itself. So all the numbers are its coprimes. For all prime numbers all the numbers except 1 and itself are co primes.
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Coprimes are numbers which have no factors except 1 in common
So all numbers are the coprimes of 19 except 1 and itself
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