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Question

If A=x, y : y=1x, 0 x R and B=x, y : y=-x, x R, then write AB.

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Solution

We have:
A=x, y : y=1x, 0 x R
= {1,1, 2,12, 3,13, 4,14, ...}
And,
B=x, y : y=-x, x R
= 1, -1, 2, -2, 3, -3, 4, -4, ...
Thus, we get:
AB =

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