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3 Cards in this Set

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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