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.
Select every other element of a vector
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Scoring for oriented dominoes
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find the maximum element of the matrix
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give nth decimal place of pi
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