Explicație pas cu pas:
[tex] \large \bf \dfrac{P_{n + 1}}{P_{n}} = 42[/tex]
[tex] \large \bf \dfrac{(n + 1)!}{n!} = 42[/tex]
[tex]\large \bf \dfrac{(n + 1) \cdot n!}{n!} = 42[/tex]
[tex]\large \bf \dfrac{(n + 1) \cdot \not n!}{ \not n!} = 42[/tex]
[tex]\large \bf n + 1 = 42[/tex]
[tex]\large \bf n = 42 - 1[/tex]
[tex] \color{red}\Large \boxed{ \bf n = 41}[/tex]
#copaceibrainly
