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Wahahaha, I should've seen this sooner...
Let's see...
If you only have one pool in which you may draw two numbers from, but there are five pools, that means there is a multiplication factor of 5.
Each number in that set can only be paired with a number of the set minus that number in that set. Therefore, (9+8+7+6...+1).
Each successive set is 10. There are four remaining pools to draw from, so that is 10^4.
Therefore, you have...
(9+1)9/2 = 45
10^4 = 10,000
5(45)(10,000) = 2,250,000
Your total number of possible combinations is 2,250,000.
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