Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

How is this possible?

  1. Mar 13, 2005 #1
    N!
    ____
    n!(N - n)!

    N = 16 n = 3

    so,

    16!
    ____
    3!13! = 560

    i don't know how to get the 560 answer?
     
  2. jcsd
  3. Mar 13, 2005 #2
    (16*15*14)/(3*2*1)
     
  4. Mar 13, 2005 #3

    chroot

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    You can write a factorial like 16! as 16*15*14*13!.

    The 13! then cancels on top and bottom, leaving what gnome indicated.

    - Warren
     
  5. Mar 14, 2005 #4
    thanks :surprised
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?