Write using Factorials: (n+7) (n+6) (n+5)
4 answers
(n+7)! / (n+4)!
Do you mind my asking how you got that?
consider 9*8*7
9! = 9*8*7*6*5*4*3*2*1
6! = 6*5*4*3*2*1
So, in 9!/6! all the factors of 6! cancel out
dividing (n+7)! by (n+4)! cancels all the factors except the 3 biggest ones.
9! = 9*8*7*6*5*4*3*2*1
6! = 6*5*4*3*2*1
So, in 9!/6! all the factors of 6! cancel out
dividing (n+7)! by (n+4)! cancels all the factors except the 3 biggest ones.
well say n = 1
you would have
(1+7)(1+6)(1+5) (1+4)(1+3)(1+2) (1+1) / (1+4)(1+3)(1+2)(1+1)
= (1+7)(1+6)(1+5)
you would have
(1+7)(1+6)(1+5) (1+4)(1+3)(1+2) (1+1) / (1+4)(1+3)(1+2)(1+1)
= (1+7)(1+6)(1+5)