Doddy -- I think the last two columns of y_correct in problem 4 are incorrect.
@William , I think it is correct.
Binbin -- Yes, I see. It's just a more difficult problem than I thought it was!
@William， Yes. It is hard to guess the author's thoughts
Convert from Base 10 to base 5
Matrix multiplication across rows
Find the Pattern 10
Matrix Pattern 8
Number Puzzle - 026
Number Puzzle - 077
Number Puzzle - 080
Period of a pendulum
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