Interesting problem but tests are too tricky.
I am not sure that a list of equal numbers qualifies as a series. Would it be a geometric or an arithmetic series?
Find relatively common elements in matrix rows
Reverse Run-Length Encoder
Find state names that end with the letter A
Mersenne Primes vs. All Primes
Signal Processing Basic - 1. Stretch a signal
Graph Algorithms 3: Number of Connected Components
Magnet and Iron
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