1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Getting n alone in n!=x and nlgn=x

  1. Sep 10, 2009 #1
    1. The problem statement, all variables and given/known data

    I need to know the greatest n for which n! is greater or equal to x, and the greatest n for which nlgn is greater or equal to x.

    2. Relevant equations

    Can't think of any. Sorry!

    3. The attempt at a solution

    For a "normal" function, like, say, lgn or n^2, it would be as easy as inverting the function and getting n on its own, like this:

    lgn = x
    n = 2^x (where lg is of base 2)

    or

    n^2 = x
    n = sqrt(x).

    However, for n!=x and nlgn=x I can't come up with a way to do this. Help!
     
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted