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
The Goldbach Conjecture
Duplicate each element of a vector.
Side of an equilateral triangle
Calculate area of sector
Number Puzzle - 065
Matrix Pattern 4
Number Puzzles - 008
Number Puzzle - 028
Number Puzzle - 105
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