Why are so many solutions lost?
Angle between Two Vectors
Calculate the area of a triangle between three points
Unique values without using UNIQUE function
Back to basics - mean of corner elements of a matrix
Toeplitize a matrix
Mersenne Primes vs. All Primes
Rule of mixtures (composites) - reverse engineering
Lights Out 7 - 5x5, x moves
Rule of mixtures (composites) - lower bound
Divisible by 12
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