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.
First non-zero element in each column
Determine Whether an array is empty
Getting the absolute index from a matrix
Count up then down
Is this triangle right-angled?
count any radix?
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