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Permutations , combinations and binomial expansion — Statistics STD 11 Commerce — Question

Gujarat BoardEnglish MediumSTD 11 CommerceStatisticsPermutations , combinations and binomial expansion2 Marks
Question
Expand $\left( x-\frac{}{x}\right)$
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Answer

$27 x^3-81 x+\frac{81}{x}-\frac{27}{x^3}$

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