Saturday

November 22, 2014

November 22, 2014

Posted by **sh** on Sunday, March 29, 2009 at 8:39pm.

(n+1)!/(n-1)!

my work:

(n+1)!/((n+1)(n-1)!)

=1/(n-1)?

Thanks in advance.

- math -
**Reiny**, Sunday, March 29, 2009 at 9:05pmclose

(n+1)!/(n-1)!

= (n+1)(n)(n-1)!/((n+1)(n-1)!

= n

- math -
**sh**, Sunday, March 29, 2009 at 9:23pmhmm..the answer key says its n(n+1), maybe the answer key is wrong

- math -
**sh**, Sunday, March 29, 2009 at 9:26pmwait, nevermind, I got it :)

thanks :P

- math -
**Reiny**, Sunday, March 29, 2009 at 9:28pmYou know what?

I looked at "my work" and assumed that was the starting question.

so here it goes once more

(n+1)!/(n-1)!

= (n+1)(n)(n-1)!/n-1)!

= n(n+1)

sorry

I should be more careful when reading questions.

**Answer this Question**

**Related Questions**

math - write each expression without using the factorial symbol. 1)(n-3)! ----- ...

factorial help!!! - i just need help with factorials I assume you know what a ...

algebra - using exactly four 3's and any math symbol you like, try to write an ...

Math help please - 7. In the expression –7x – 5x2 + 5, what is the coefficient ...

Math Help? Check my answers. - 1. Name the coefficients in the polynomial. 4x^2...

math - Evaluate the factorial expression 8!/6! Use the formula for nPr: How many...

math - Thank you in advance. How do you write an equivalent expression using ...

chemisrty - I have seen on the chemistry answers that a symbol is used please ...

Math - Use the expression 12*12 to answer the question below A. Write the ...

math - simplify the expression; write without using negative exponents. Assume ...