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Please help!!! http://data.artofproblemsolving.com/aops20/latex/images/415c8b464a4b758e8a2a3b6052eee5f2da79eeec.png
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Are you supposed to use complementary counting? I don't know :(
I know I'm supposed to use casework counting...
Tina can choose from this set of numbers 1,2, 3, 4, 5 and sergio can choose from 1, 2, 3. 4, 5 , 6 ,7 ,8 9 10 that is what I am setting up here|dw:1376309230289:dw|
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