What is the coefficient of $x^3$ in the expansion of $$(x+2\sqrt3)^7?$$
Question:
What is the coefficient of $x^3$ in the expansion of $$(x+2\sqrt3)^7?$$
Answer:
Let's think step by step.

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What is the coefficient of $x^3$ in the expansion of $$(x+2\sqrt3)^7?$$
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