Question

sendo(m+1)m!/(m+2)!=1/10

Answer 1

(m+1).m!/(m+2)!=1/10
(m+1).m!/(m+2)(m+1).m!=1/10  conta (m+1) com (m+1) e m com m
1/(m+2)=1/10
(m+2).1=1.10
m+2=10
m=10-2
m=8