Level:
Project ID:
1003107210
Source Problem:
Accepted:
1
Clonable:
1
Easy:
0
Solve the inequality with the variable $x$, where $x$ is a natural number:
$$\sum\limits_{n=1}^x \left(\frac25n-1\right) \leq x $$
$ x\leq9;\ x\in\mathbb{N}$
$x\leq10;\ x\in\mathbb{N}$
$x\in(-\infty;8]$
$x\geq8;\ x\in\mathbb{N}$
there is no solution in $\mathbb{N}$