Respuesta :

mathstudent55

Answer:

a. 21

b. 20

Step-by-step explanation:

a. 3 and 7 are prime numbers, so their LCM is their product, 21

b.

4 = 2^2

5 = 5

LCM = 2^2 * 5 = 20

Answer:

a. 21

b. 20

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