What is the sum of the following sequence:
Σ(-1)^(k+1) (2k-1)^2 for k=1...n
for different n?
Additional test cases have been added.
Please check your test suites, results must have opposite signs.
Thanks! The problem now is reformulated;)
give nth decimal place of pi
Sum all integers from 1 to 2^n
Return 'on' or 'off'
Is it a number?
Sum of series VI
Sum of series V
Sum of series III
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