MCQ
If $3\text{x}-7<5+\text{x},11-5\text{x}\leq1,$, then $\text{x}\in$
- A$\big[2, 6\big]$
- B$\big[–2, 6\big]$
- C$\big[2,6\big)$
- D$\big(-2,6\big)$
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Five persons entered the lift cabin on the ground floor of an 8 floor house. Suppose that each of them independently and with equal probability can leave the cabin at any floor beginning with the first, then the probability of all 5 persons leaving at different floor is: