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If ("lim")(x->1)(2-x+a[x-1]+b[1+x]) exis...

If `("lim")_(x->1)(2-x+a[x-1]+b[1+x])` exists, then `a and b` can take the values of (where [.] denotes the greatest integer function). (a)`a=1/3,b=1` (b) `a=1, b=-1` (c) `a=9, b=-9` (d)`a=2, b=2/3`

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