LCM( 11, 7 ) = 77
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 11, b = 7 and GCD(11, 7) = 1.
$$ \text{LCM} (11, 7) = \frac{ 11 \cdot 7 }{ \text{GCD}(11,7)} = \frac{ 77 }{ 1 } = 77 $$