LCM( 3, 25 ) = 75
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 = 25 and GCD(3, 25) = 1.
$$ \text{LCM} (3, 25) = \frac{ 3 \cdot 25 }{ \text{GCD}(3,25)} = \frac{ 75 }{ 1 } = 75 $$