What is the sum of the following sequence:
Σk(k+1) for k=1...n
for different n?
Additional test cases have been added.
Remove all the words that end with "ain"
CONVERT TAN TO SIN
sum of first 'n' terms
length of a vector
find the surface area of a cube
Sum of series VI
Sum of series II
Sum of series III
Sum of series IV
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