Every one of the 5 available lamps can be switched on to illuminate certain Hall. The…
Mathematics · JEE Main · NTA Exams — Permutations and Combinations
Every one of the 5 available lamps can be switched on to illuminate certain Hall. The total number of ways in which the hall can be illuminated, is :
- 32
- 31
- 5
- 5!
Answer
(B) 31
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