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In the expansion (x+a)^(n) , if the sum ...

In the expansion `(x+a)^(n)` , if the sum of odd terms is denoted by O and the um of even term by E . Then ,prove that
`4OE =(x+a)^(2n)-(x-a)^(2n)`

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The correct Answer is:
` = (x+a)^(2n)-(x-a)^(2n)`
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