688-521=167 Got wrong!
Which values occur exactly three times?
Back to basics 17 - white space
Create a square matrix of multiples
Reindex a vector
Dimensions of a rectangle
RISK board game battle simulation
It's race time! Write a faster function than the test suite call of unique().
Penny flipping - calculate winning probability (easy)
Calculate the probability that at least two people in a group share the same birthday.
It's race time again! Write a function that is at least twice as fast as the test suite call of repmat().
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