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Find the points of discontinuity of y = ...

Find the points of discontinuity of `y = (1)/(u^(2) + u -2)`, where `u = (1)/(x -1)`

A

`x=2, 1/2`

B

`x=1, 2, 1/2`

C

`x=2, (-1)/(2)`

D

`z=1, 2, (-1)/(2)`

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The correct Answer is:
B
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