Question

Out of 15, 16, 21 and 28, find out all the pairs of co-prime numbers.​

Answer 1

Step-by-step explanation:

all numbers are having more than 2 factors...so none of them form a co prime numbers

Answer 2

Answer:

1st pair is ---15 & 16

2nd pair is --- 16 & 21

Step-by-step explanation:

factors of 15 --3*5 and the factors of 16 --2*2*2*2 ,so 15 & 16 are co-prime numbers.

factors of 16 --2*2*2*2 and the factors of 21 --3*7 , so 16 & 21 are co-prime numbers .