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If 1xx2xx3xx...xxn is denoted by lfloorn...

If `1xx2xx3xx...xxn` is denoted by `lfloorn` , then `lfloor8-lfloor7-lfloor6` is equal to
(a) `6xx7xxlfloor8`
(b) `7xx8xxlfloor7`
(c) `6xx8xxlfloor6`
(d) `7xx8xxlfloor6`

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