Hi all, need some help here,

Simplify

2n+2

. .Pn

2n

. .Pn

thanks

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- Mar 24th 2008, 12:19 AMmicmac63Permutation.......
Hi all, need some help here,

Simplify

2n+2

__. .____Pn__

2n

. .Pn

thanks - Mar 24th 2008, 01:45 AMmr fantastic
- Mar 24th 2008, 01:58 AMmicmac63
yes, but dont quite understand ?????

- Mar 24th 2008, 02:03 AMmr fantastic
- Mar 24th 2008, 02:31 AMmicmac63
Thankyou so much, Im helping my daughter with this, and she is on right track now,

if the equation equals 3.5, find the value of n ?

thanks again. - Mar 24th 2008, 03:41 AMmr fantastic
Solve $\displaystyle \frac{(2n+2)(2n+1)}{(n+2)(n+1)} = \frac{7}{2} \Rightarrow 2(2n+2)(2n+1)=7(n+2)(n+1) .....$

Expand both sides and re-arrange into the form:

quadratic = 0.

Solve this equation in the usual way, noting the restriction $\displaystyle n \geq 0$.

For checking purposes: n = 10.