Question

determinati numarul natural n pentru care 2n+1 divide pe 18

Answer 1

2n+1 I 18
D18={1,2,3,6,9,18}
2n+1=1
2n=1-1
2n=0
n=0

2n+1=3
2n=2
n=1

2n+1=9
2n=8
n=4

n ∈{0,1,4}