LIVE Course for free

Rated by 1 million+ students
Get app now
+1 vote
in Mathematics by (2.8k points)

Please log in or register to answer this question.

2 Answers

+1 vote
by (24.2k points)

Since each light can be switched on independently,

there are two options for each bulb (on or off)

∴Total no. of ways the bulbs can be operated= 210

This includes all the bulbs are kept in off so that the room is not illuminated.

∴ The no. of ways in which the room is illuminated=210−1=1023

+1 vote
by (130 points)

total no:of ways are 210 (for ON &OFF)

no:of ways room illuminated is 1 way switch off all lights 

so no:of ways room glow is 210-1=1023

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.