The Expansion of (a + b)n If $n$ is any positive integer, then
$(a + b)^n = a^n + {_nC_1}a^{n - 1}b + {_nC_2}a^{n - 2}b^2 + \, \cdots \, + {_nC_m}a^{n - m}b^m + \, \cdots \, + b^n$
Where ${_nC_m}$ = combination of n objects taken m at a time.
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