Question

What is the least common multiple of 3, 6, and 7?

Answer 1

3|3
1

6|2
3|3
1

7|7
1

LCM = 2*3*7 = 42

Answer 2

6|2
3|3
1

3 and 7 are prime numbers.

$LCM(3,6,7)=2\cdot3\cdot7=42$