81. What is wrong with the following calculation? 0 =0 +0 + 0 + ... = (1 – 1) + (1 – 1) + (1 – 1) + ... = 1 – 1 + 1– 1 + 1 – 1 +. .. = 1 + (-1 + 1) + (-1 + 1) + (-1 + 1) + · . . = 1 + 0 + 0 + 0 + . ..= 1

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A: Here is the solution:

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