Every one of the 10 available lamps can be switched on to illuminate certain Hall. The…
Mathematics · JEE Advanced · NTA Exams — Permutations and Combinations
Every one of the 10 available lamps can be switched on to illuminate certain Hall. The total number of ways in which the hall can be illuminated, is :
- 55
- 1023
- 210
- 10!
Answer
(B) 1023
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