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.
Triangle Numbers Below N
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Area of an equilateral triangle
Side of an equilateral triangle
Side of a rhombus
Distance walked 2D
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Simple spirometer - find your lung capacity from the number and size of soap bubbles in one breath
chance in percent for minimum K heads when a good coin is tossed N times?
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