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A "proof" that 1 + 1 = 1

Where is the error?

To see the answer, pass your mouse over the colored area.
To cover the answer again, click "Refresh" ("Reload").
Consider the problem yourself first!

The error is in going from Line 4) to Line 5). Since x = 1, then x −1 = 0. We have divided by 0, an operation that is not permitted.  See Lesson 5.


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