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If f(x)=sgn(x-2) xx [In x], 1leq x leq ...

If `f(x)=sgn(x-2) xx [In x], 1leq x leq 3 and {x^2} ,-3 lt x leq 3.5` where [.] denotes the greatest integer function and {.} represents the fractional part functon, then the number of points of discontinuity in `[1,3.5]` is

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