# Limiting Sum maths in focus question, find t?

Hi can anyone help, I am really not too sure how they got this answer, the question is

For what values of k does the limiting sum exist for the series …? k+ k^2 + k^3....

the answer is -1<k<1

For what values of k does the limiting sum exist for the series …? k+ k^2 + k^3....

the answer is -1<k<1

Update:
K not T!!!

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