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I wanted an expansion of $(1+x)^n$ and refered Wikipedia but I don't understand why there is a condition of $|x|<1$.

In general, for the series, the condition is not required am I right or am I missing something subtle?

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@AndréNicolas. Gotcha. Thanks! –  Inquest Jan 19 '13 at 20:32
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up vote 2 down vote accepted

For the ordinary Binomial Theorem, where $n$ is a non-negative integer, there is no $|x|\lt 1$ restriction. In the generalization of the ordinary Binomial Theorem to situations where $n$ is not necessarily a non-negative integer, you get an infinite series that only converges if $|x|\lt 1$.

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