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.
Project Euler: Problem 6, Natural numbers, squares and sums.
Flag largest magnitude swings as they occur
Set some matrix elements to zero
Generate N equally spaced intervals between -L and L
give nth decimal place of pi
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Angle of triangle
old wine in a new bottle?
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