Question

Soluția inecuatiei 3x+1< sau= 10,x€N

Answer 1

x ∈ ℕ 
$3x+1 \leq 10$
$3x \leq 10-1$
$3x \leq 9$
$x \leq \frac{9}{3}$
$x \leq 3$
x ∈ ℕ => x ∈ {0, 1, 2, 3}