LCM( 3, 14 ) = 42
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 3, b = 14 and GCD(3, 14) = 1.
$$ \text{LCM} (3, 14) = \frac{ 3 \cdot 14 }{ \text{GCD}(3,14)} = \frac{ 42 }{ 1 } = 42 $$