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What is the formula?
(1+a)^n = 1+na+(n(n-1)/2!)a^2 + (n(n-1)(n-2)/3!)a^3 +...
If n is not a positive integer...
The series is infinite and valid - 1<a<1
When is it valid?
When a lies between -1<a<1 e.g.-1<2x<1
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