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A few questions

  1. Jul 20, 2011 #1
    1. Find the number of pairs (m, n) such that 2m - 2n = 63 in which m and n are nonnegative integers.

    2. What is the units digit of 625 - 324 ?

    3. How many perfect squares divide the number 4!*5!*6! ?

    4. What is the last digit of the sum 1! + 2! + 3! + ... + 2010! + 2011! ?

    Thanks!
     
  2. jcsd
  3. Jul 20, 2011 #2
    it does not quite work like that....you need to show some genuine effort of what you have tried and show us where you are stuck, etc.
     
  4. Jul 20, 2011 #3
    Yeah, sorry, never mind. I got them solved.
     
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