Can you give us any hints? I tried findobj() but can't make progress!
You are on the right track with findobj(). The trick is what the call to "legend" does to the objects that make the solution very simple.
Find the palindrome
Find state names that start with the letter N
Determine if a Given Number is a Triangle Number
Solve the Sudoku Row
Big numbers, repeated least significant digits
Generate a NaN...on purpose
Big numbers, least significant digits
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