Math Challenges: Find Pairs, Units Digit, Perfect Squares, Last Digit

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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!
 
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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.
 
Yeah, sorry, never mind. I got them solved.
 

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