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Find the coefficient of a^3b^4c in the e...

Find the coefficient of `a^3b^4c` in the expansion of `(1+a-b+c)^9dot`

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To find the coefficient of \( a^3b^4c \) in the expansion of \( (1 + a - b + c)^9 \), we can use the multinomial theorem. Here’s the step-by-step solution: ### Step 1: Identify the terms in the expansion The expression can be rewritten as: \[ (1 + a + (-b) + c)^9 \] We need to find the coefficient of \( a^3b^4c \). ...
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