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Expand using Binomial Theorem (1+ x/2 - ...

Expand using Binomial Theorem `(1+ x/2 - 2/x)^4` , x!= 0.

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The correct Answer is:
`16/x + 8/(x^2) - 32/(x^3) + 16/(x^4) - 4x + (x^2)/2 + (x^3)/2 + (x^4)/16 - 5`
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