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If f(x) = [x] - [x/4], x in R where [x] ...

If `f(x) = [x] - [x/4], x in R` where [x] denotes the greatest integer function, then

A

`sqrt(A +1)`

B

`sqrt(A + 21)`

C

`sqrtA`

D

`sqrt(A +5)`

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The correct Answer is:
A
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