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If ain RR and the equation -3(x-[x])^2...

If `ain RR` and the equation
`-3(x-[x])^2+2(x-[x])+a^2=0` (where [x] denotes the greatest integer `lex)` has no integral solution, then all possible values of a lie in the interval____

A

`(-1,0)cup(0,1)`

B

(1, 2)

C

(-2, -1)

D

`(-oo, -2)cup(2, oo)`

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