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Find the sum of the coefficients in the ...

Find the sum of the coefficients in the expansion of `(1+2x+3x^2+ n x^n)^2dot`

Text Solution

Verified by Experts

The correct Answer is:
`sumn^(3)`
Fo sum of coefficient, put `x = 1`. Therefore,
`(1+2+3+"….."n)^(2) = ((n(n+1))/(2))^(2) = sumn^(3)`
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