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Question

The domain of f(x)=x1x2 is

A
[1,12][12,1]
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B
(,12][12,)
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C
[1,1]
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D
[12,1]
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Solution

The correct option is D [12,1]
For the function f(x)=x1x2 to be defined
x1x20, 1x20x[1,1]...(1)x1x2, x[1,1]x0 (x1x20)...(2)x21x2, x[1,1]x212, x[1,1]x(,12][12,)...(3)

From (1),(2) and (3)
x[12,1]

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