688-521=167 Got wrong!
give nth decimal place of pi
Determine Whether an array is empty
sum of non-primes
Sum the Digits of a Number
Find out sum of all elements of given Matrix
Penny flipping - calculate winning probability (easy)
Create matrix of replicated elements
It's race time again! Write a function that is at least twice as fast as the test suite call of repmat().
It's race time! Write a faster function than the test suite call of unique().
Calculate the probability that at least two people in a group share the same birthday.
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