Question

Determinati toate numerele care impartite la 13 dau restul egal cu catul.

Answer 1

n:13=c rest r cu r=c ⇒ prin Teorema impartirii cu rest n=13c+c unde 0≤c<13    ⇒n=14c unde c∈{0,1,2,3,4,5,6,7,8,9,10,11,12} ⇒        
n∈{0,14,28,42,56,70,84,98,112,126,140,154,168}