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.
Times 2 - START HERE
Sum all integers from 1 to 2^n
Who knows the last digit of pi?
Equal to their cube
Minimum possible M of the maximum side of a triangle of given area A.
Given a square and a circle, please decide whether the square covers more area.
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