The lcm of 3 and 21 is _____ if gcd(3,21)=3.
A. 3
B. 12
C. 21
D. 42
Answer:A
The lcm of 3 and 21 is _____ if gcd(3,21)=3.
A. 3 B. 12 C. 21 D. 42
Explanation: 3 * lcm(3, 21) = 63 hence, lcm(3, 21) = 63 / 3 = 21.