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Binomial Expansion Question C2

The bit underlined in red. What is going on?
bino.PNG
Reply 1
Avatar for TenOfThem
TenOfThem
18
Original post by scientific222
The bit underlined in red. What is going on?
bino.PNG


Not sure what you do not understand

(n-2)! = (n-2) x (n-3)!

Since (n-2)! = (n-2)(n-3)(n-4)(n-5) ... ... ... ...

And (n-3)! = (n-3)(n-4)(n-5) ... ... ... ...
Original post by TenOfThem
Not sure what you do not understand

(n-2)! = (n-2) x (n-3)!

Since (n-2)! = (n-2)(n-3)(n-4)(n-5) ... ... ... ...

And (n-3)! = (n-3)(n-4)(n-5) ... ... ... ...


I understand now thank you. I previously didn't understand the use of variables in factorials , it was the first time I came across it
Reply 3
Avatar for TenOfThem
TenOfThem
18
Original post by scientific222
I previously didn't understand the use of variables in factorials , it was the first time I came across it


Ah .. ok

Glad to have helped :smile:

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