Question

Afla toate numerele naturale de forma abc in care 4a+b+c=12

Answer 1

a+b+c=12/4
⇒a+b+c=3;
⇒a∈[1,2,3]
⇒b∈[0,1,2,3]
⇒c∈[0,1,2,3]
⇒numerele sunt 102,120,111,201,210,300⇒6 numere naturale;