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Which of the following are correct (wher...

Which of the following are correct (where `[.]` denotes greatest integer function and `{.}` fractional part function)
(a) `1 le [x] le 5 rArr x in [1,6)`
(b) `ubrace(sgn(sgn(sgn(sgn"........"sgn(x)))))_("n times composition")=sgn(x)`

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