Question

sum of cofficent (1+5x-7x^3)^2020​

Answer 1

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Because 2020 is even number.

we know that when power is even and base is negative,then result is positive.

Final Answer:Sum of coefficients in the expansion of

\begin{gathered}\bold{( {1 + 5x - 7 {x}^{3} )}^{2020}} \\ \end{gathered}

(1+5x−7x

3

)

2020

is 1.

Hope it helps you.

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