For this week's work :
Try 2013 Mathworks Math Contest problems from Texas State University
Answer key and statistics can be viewed here.
I'll send you detailed solutions once we finish all the problems.
Practice more "at least" problems :
2014 AMC-10 B problem 16
Solution
From Mathcounts Mini : Video tutorials on counting and probability for Mathcounts state/national prep concepts are in order the of difficulty.
Counting the Number of Subsets of a Set
Constructive Counting
More Constructive Counting
Probability and Counting
Monday, June 9, 2014
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