anonymous one year ago (n-4)!+(4-n)!+2n!/2

1. anonymous

$\frac{ (n-4)!+(4-n)!+2n! }{ 2 }$

2. Michele_Laino

hint: if n-4>0 then n>4, so (4-n)! is not defined, being 4-n<0 and vice versa if 4-n>0

3. welshfella

going on that n can only have one value ( assuming we are only dealing with whole numbers)

4. welshfella

if n cannot be <4 nor >4 then n = ?

5. anonymous

n=4 then thank you for your help!!

6. welshfella

yw