Hej!
[tex]a_n=\frac{n!}{5}\\\\a_5=\frac{5!}{5}\\\\a_5=\frac{1\cdot2\cdot3\cdot4\cdot\not5^1}{\not5_1}\\\\a_5=1\cdot2\cdot3\cdot4\\\\\boxed{a_5=24}[/tex]
Pozdrawiam! - Julka
