cd and lcm gcd(a, b)is the largest positive integer that divides both a and b Icm(a, b )is the smallest positive integer divisible by both a and b lcm(a, b=a*b/gcd(a,b) a and b are said to be relatively prime or coprime if gcd(a, b)=1 p>2 is prime if its only positive divisors are l and p 2020 gcd and lcm • gcd(a,b) is the largest positive integer that divides both a and b • lcm(a,b) is the smallest positive integer divisible by both a and b • lcm(a,b)=a*b/gcd(a,b) • a and b are said to be relatively prime or coprime if gcd(a,b)=1 • p ≥ 2 is prime if its only positive divisors are 1 and p