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The sum of all the coefficients in the expansion of $$(1 - 2x + 3x^2)^9$$ is
$$4^9$$
$$2^{11}$$
$$2^9$$
$$0$$
$$(1 - 2x + 3x^2)^9$$
substitute x=1
$$(1 - 2\times1 + 3\times1^2)^9$$
$$(1 - 2 + 3)^9$$
$$(2)^9$$
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