Given the diameter d of the inner circle of the annulus. Given length z of a chord of the outer circle of the annulus. This chord is tangent to the inner circle of the annulus. Find the area y of the annulus.
Getting logical indexes
Given a window, how many subsets of a vector sum positive
Create sequnce 1 4 9 16 25.........
How many palindromes?
Person of interest?
Multiply a column by a row
Distance walked 1D
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