Which of the following pairs of numbers are co-prime: a) 18 and 35 b) 15 and 37 c) 30 and 415 d) 17 and 68 e) 216 and 215 f) 81 and 16?
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Two positive integers are said to be co-prime if their greatest common divisor (GCD) is 1. a) GCD(18, 35) = 1, therefore 18 and 35 are co-prime. b) GCD(15, 37) = 1, therefore 15 and 37 are co-prime. c) GCD(30, 415) = 5, therefore 30 and 415 are not co-prime. d) GCD(17, 68) = 17, therefore 17 and 68Read more
Two positive integers are said to be co-prime if their greatest common divisor (GCD) is 1.
a) GCD(18, 35) = 1, therefore 18 and 35 are co-prime. b) GCD(15, 37) = 1, therefore 15 and 37 are co-prime. c) GCD(30, 415) = 5, therefore 30 and 415 are not co-prime. d) GCD(17, 68) = 17, therefore 17 and 68 are not co-prime. e) GCD(216, 215) = 1, therefore 216 and 215 are co-prime. f) GCD(81, 16) = 1, therefore 81 and 16 are co-prime.
Therefore, the pairs of co-prime numbers are:
a) 18 and 35 b) 15 and 37 e) 216 and 215 f) 81 and 16
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