I got tired of solving these problems. So, I just wrote a solution that works for everything.
Sums with Excluded Digits
Make a random, non-repeating vector.
Permute diagonal and antidiagonal
03 - Matrix Variables 3
Rule of mixtures (composites) - weighted bound
Divisible by n, prime vs. composite divisors
Self-similarity 3 - Every other pair of terms
Stress-Strain Properties - 7
Mechanical Advantage of a Gear Train
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