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My answer is not same as solution provided. I have included June data so my solution is different but the methodology should solve it
Challenge Completed!
My solution :-)
As some others mentioned in the comments below, I too was counting tickets starting 6/1/2013. after reading comments adjusted my filter to 7/1/2013. Good use of crosstab on this one. Spoiler alert!
Getting there …
Solution
I used extra formulas instead of a secondary lookup table.