" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
(n+1)!/(n-1)!= [(n-1)! * n * (n+1)]/(n-1)!=n(n+1)=n²+n
h)
[(n+1)!-n!]/(n-1)!=[(n-1)!*n*(n+1)-(n-1)!*n]/(n-1)!=n(n+1)-n=n²+n-n=n²