I like your "calendar" problems serie. They are efficient to understand how Matlab represent dates and times.
Find state names that end with the letter A
Derivative of polynomial
select the primes of a vector
Area of a Square
Check that number is whole number
Matrix multiplication across rows
Create a matrix with difference of each row of input matrix
Sum of diagonals elements of a matrix
Who is the baby and who is the daddy in this family?
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