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Question

If A=x, y : y=ex, x R and B=x, y : y=e-x, x R, then write AB.

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Solution

We have:
A = 0, 1, 1, e, 2, e2, 3, e3, ...
B = 0, 1, 1, e-1, 2, e-2, 3, e-3, ...
Thus, we get:
AB = 0, 1

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