• Thanks dear Sahar for the interesting discussions you provide for us.

    Have a nice time


    • You are welcome!

      And thanks for your time, dear.

      You are always good at solving all kinds of puzzles.

  • I guess -50 is the answer.

    The even powers of x give zero.

    The odd powers of x give -1.

    Since we have 50 odd terms in the lim, so we have -1*50= -50

    • Well done!

      It is right exactly.

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