Karen has three times the number of cherries that Lionel has, and twice the number of cherries that Michael has. Michael has seven more cherries than Lionel. How many cherries do Karen, Lionel and Michael have altogether?
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2^2 - 1
2^3 - 1
2^5 - 1
2^7 - 1
2^{11} - 1
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Senior Mathematical Challenge 2014 (2014)
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