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f(x) = sgn(x^2 - ax + 1) has maximum num...

`f(x) = sgn(x^2 - ax + 1)` has maximum number of points of discontinuity then

A

` in (2,oo)`

B

`a in (-oo,-2)`

C

`a in (-2,2)`

D

none of these

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The correct Answer is:
A, B
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