There are 10 lamps in a hall. Each one of them can be switched on independently. The number of ways in which hall can be illuminated is
A. 102
B. 1023
C. 210
D. 10 !
Answer:B
There are 10 lamps in a hall. Each one of them can be switched on independently. The number of ways in which hall can be illuminated is
A. 102 B. 1023 C. 210 D. 10 !