Need help with a factorial question (Binomial Theorem) (1 Viewer)

thgus2114 · Dec 19, 2018

1. factorise
k! + (k + 1) !

2. Simplify
(K-1)!/K!

I don't understand the process of the solution!
Can someone explain how to solve these 2 questions?
Thank you!!!

fan96 · Dec 19, 2018

Use the definition of a factorial:

$n! = n \times (n-1) \times (n-2) \times ... \times 1$

In particular,

$n! = n \times (n-1)!$

This means we can write

$k! + (k+1)! = k(k+1)! + 1(k+1)!$

thgus2114 · Dec 20, 2018

Thank you. I get it now

)

Need help with a factorial question (Binomial Theorem) (1 Viewer)

thgus2114

New Member

fan96

617 pages

thgus2114

New Member

Users Who Are Viewing This Thread (Users: 0, Guests: 1)