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#1.
first digit has 4 choices (2,3,4,5)
second, third, fourth digits each has 5 choices (all 5)
fifth digit can only have even or 0 or 5 ( all but 3) so that makes 4 choices
4x5x5x5x4 =2000
#2. working on it...
#3. 10x10x10x10=10000
#4. P(k,r) = kPr <--- Permutation where k=total number, r=selected number
Last edited by mystic87 : 07-21-2008 at 04:46 PM.
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