Question

BC 12,18

Answer 1

12 = 2² × 3 

18 = 2 × 3² 

BCNN( 12,18 ) = 2² × 3² = 36 

BC(12,18) = B(12,18) = { 0; 36; 72; 108;....}

Answer 2

\(12=2^2.3\)  ; \(18=3^2.2\)

\(BC\left\{12;18\right\}=3^2.2^3=72\)

\(BC\left\{72\right\}=\left\{72;144;216;...\right\}\)