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1. x+1x=7

  • A. 364
  • B. 364
  • C. 364
  • D. 364

Answer: Option A

Explanation:

(x-(1/x))=7

(x3-(1/x)3)=(x-(1/x))3-3.x.(1/x)(x-(1/x))

=73-3(7)

=343+21

=364

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