Answer:
7
Step-by-step explanation:
The LCM or least common muitiple is the least common number between the two numbers when you muitliply them.
3*7=21
Therefore, 7 is the answer.
21
Using the GCF for the LCM formula:
The GCF of 21 and 3 is 3.
LCM(3,21) = ( 3 × 21) / 3
LCM(3,21) = 63 / 3
LCM(3,21) = 21
