Question

Determinati numarul natural n pentru care 2n+1 divide 18 ?

Answer 1

Deci 2n+1∈ Divizorilor lui 18
2n+1∈{1,2.3,6,9,18} /-1
2n∈{0,1,2,5, 8, 17} / ÷2
n ={0, 1, 4}

Answer 2

2n+1|18
2n+1∈{1,2,3,6,9,18}|-1
2n∈{0,1,2,5,8,17}|:2
n∈{0,1,4}