There are 10 lamps in a hall. Each one of them can be switched on independently. The number of ways in which the hall can be illuminated is
| A. | 102 |
| B. | 1023 |
| C. | 210 |
| D. | 10! |
Answer : B Explanation : SASIKALA K said: (7:35am on Wednesday 21st February 2018)
Total number of lamps =10Since at least one lamp is to be kept switched onThe total number of ways are10C1 10C2 ....10C1010C1 10C2 ....10C10⇒210−1⇒210−1⇒1024−1⇒1024−1⇒1023
|
|
|
Option: A Explanation : Explanation will come here. Explanation will come here. Explanation will come here. Explanation will come here. Explanation will come here. |
