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: Hwk helpp please helpp thanks in advance

  1. May 16, 2005 #1
    hwk helpp please helpp!!! thanks in advance

    "Prove each of the following using Mathematical induction;" show all steps
    pleasee someone help.. i have a test on this tommorow and i just need some examples.. could you also try to show all steps including the words so i understand how you got there? thakns so much in advance~!

    1. -1/2, -1/4, -1/8... -1/2^n = (1/(2^n))-1

    2. a + (a+d)+(a+2d)+...+[a+(n-1)d] = (n/2)[2a+(n-1)d]

    3. 1^3 + 2^3 + 3^3... + n^3 = (n^2(n+1)^2)/(4)

    4. show that (3^(4n))-1 is dividislbe by 80 for all positive integral values of n
     
  2. jcsd
  3. May 16, 2005 #2

    dextercioby

    User Avatar
    Science Advisor
    Homework Helper

    Well,did u read the HW section guidelines ?We don't do hw-s here,we only help people do their homeworks,if they get stuck.

    But u haven't even started.How about some ideas...?

    Daniel.

    EDIT:Please,DO NOT DOUBLE POST !! :grumpy:
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook