LCM( 69, 75 ) = 1725
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 69, b = 75 and GCD(69, 75) = 3.
$$ \text{LCM} (69, 75) = \frac{ 69 \cdot 75 }{ \text{GCD}(69,75)} = \frac{ 5175 }{ 3 } = 1725 $$