Extract leading non-zero digit
Filter AC, pass DC
Figurate number triangle
Back to basics 9 - Indexed References
Length of a short side
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Flip the main diagonal of a matrix
Find the nearest integer
How many days does the cat take to climb out of the hole?
Is A the inverse of B?
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