We'll need to combine this thread with your later one.
I have three questions:
Where you wrote "a E R - (0,1)", did you mean [MATH]a\in\mathbb{R}-(0,1)[/MATH], or perhaps [MATH]a\in\mathbb{R}-\{0,1\}[/MATH], which makes more sense?
Is this the exact image you were given? It would seem more reasonable to me, at first glance, if [MATH]\binom{n}{k}[/MATH] were outside the brackets.
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