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Write the sum of the coefficients in the...

Write the sum of the coefficients in the expansion of `(1-3x+x^2)^111.`

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We know,
`(x+a)^n=sum_(k=0)^n ((n), (k)) x^(n-k)a^k`
Given that,
`(1-3x+x^2)^111`
...
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