Question

Calculati:a)5!+4!/3!+6! b)9!•5!/7!•6! c)n!/(n+1)! d)(n-1)!+(n+1!)/n!+(n+1)!

Answer 1

a)5!+4!/3!+6!=
5!+3!*4/3!+6!=
5!+4+6!=844
b)9!•5!/7!•6!=
9!•5!/(5!*6*7)•6!=
9!*6!/42= 6220800
c)n!/(n+1)!=
n!/n!(n+1)=1/(n+1)
d)(n-1)!+(n+1!)/n!+(n+1)!=
(n-1)!+n!(n+1)/n!+(n+1)!=
(n-1)!+n+1+(n+1)!