Find the sum, given the first term t1, the common ratio r, and number of terms n.
If input t1=1, r=1, n=7 then output y=7
If input t1=10, r=10, n=5 then output y=111110.
Scoring for oriented dominoes
Getting the row and column location from a matrix
Insert zeros into vector
Is the input divisible by 3?
Find a Pythagorean triple
chance in percent for minimum K heads when a good coin is tossed N times?
Given a square and a circle, please decide whether the square covers more area.
area of an annulus
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