(1-x)^(1/2) - Wolfram|Alpha

In the series representation for mod. x <1 I don't understand the final k in the numerator. What does it mean?

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- Apr 19th 2012, 06:51 AMStuck Mancomplicated sigma expression
(1-x)^(1/2) - Wolfram|Alpha

In the series representation for mod. x <1 I don't understand the final k in the numerator. What does it mean?