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If a in R and the equation -3(x-[x])...

If `a in R` and the equation `-3(x-[x])^2+""2""(x-[x])""+a^2=""0` (where [x] denotes the greatest integer x) has no integral solution, then all possible values of a lie in the interval (1) `(-1,""0)uu(0,""1)` (2) (1, 2) (3) `(-2,-1)` (4) `(-oo,-2)uu(2,oo)`

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