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Shortest solution (so far) that keeps to the spirit of the challenge. Code is also easy to read.
Another short solution that keeps to the spirit of the challenge.
So many choices
Sum of first n terms of a harmonic progression
Calculate the Number of Sign Changes in a Row Vector (No Element Is Zero)
Back to basics - mean of corner elements of a matrix
Sum of series VI
Lights Out 7 - 5x5, x moves
Divisible by 6
Combined Ages 3 - Non-symmetric, n ≥ 3
Legend of Zelda - Rupee Count
Divisible by 7
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