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.
Read a column of numbers and interpolate missing data
Get the area codes from a list of phone numbers
Triangle Numbers Below N
Generate pi using logarithm
Is the input divisible by 3?
swap sign sum & multiply castles
An asteroid and a spacecraft
Distance walked 3D
area of an annulus
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