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Find the first four terms in the binomial expansion (x-7)^12

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12C0 x^12 (-7)^0 + 12C1 x^11 (-7)^1 + 12C2 x^10 (-7)^2 + 12C3 x^9 (-7)^3 + ...

x^12 - 84x^11 + 3234x^10 - 75460x^9 + ...

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