N bulbs in a circle
There are n bulbs in a circle, each bulb has one switch associated with it, on operating the switch, it toggles the state of the corresponding bulb as well as two bulbs adjacent to that one. Given all bulbs are in off state initially, Give a situation when we can turn on all the bulbs.
Note: Number of bulbs are more then 1 i.e N>1
Every bulb can be switched by its previous bulb,by itself and by bulb following it .
So if we switch all bulbs sequentially,a bulb in between changes its state 3 times,which results in chng of its state from initial(3%2=1).
If all bulbs are switched from 1 to n sequentially all bulbs, including 1 and n
change there state .
Therefore to switch all bulbs on we only need to switch them on sequentially,
irrespective of their n value.
More puzzles to try-
Born in 18th centuryIt was born in the 18th century, yet still live on today. Appearing on TV when he has something to ...Read More »
What does it means riddleWhat does this mean? Pot ooooooooRead More »
Car selling in silent auction puzzleYou are hosting a silent auction to sell your antique car. The rules are: (1) prospective buyers bid for your ...Read More »
Fake FIR riddleOne theft happens in a village and police inspector asked one constable to reach the spot and take the FIR. ...Read More »
Parrot on SellJohn went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique ...Read More »
Maths Puzzle, can you Solve it?2+3=8, 3+7=27, 4+5=32, 5+8=60, 6+7=72, 7+8=?? Solve it?Read More »
Prove Your InnocenceThe store room of your house is locked with a certain lock that can be closed without a key but ...Read More »
Number Of Races PuzzleIn order to complete the racing competition, the London racetrack has to submit its top and the most famous three ...Read More »
Tricky ONE word IAS Puzzles1. Bay of Bengal is in which state? 2. What happened when wheel was invented? 3. If you throw a ...Read More »
Cubicle paintingAn office is divided into 8 cubicles. How many of the cubicles are painted if only 1/8 of the cubicles ...Read More »
House by the side of RoadWhile going to your grandmother’s house, you counted Twenty houses on the right side. While returning back to your home, ...Read More »
Complete meaningful sentence riddleIt is a word of six; Its first three letters refer to an automobile; Its first four letters is a ...Read More »
How do you get out alive?Imagine you are swimming in the ocean and a bunch of hungry sharks surround you. How do you get out ...Read More »
Sitting ArrangementEight friends – Nancy, Harris, Jim, Feona, Daniel, Tony, Mary and Susan are sitting around a circular table. Susan is ...Read More »
Find “THE HIDDEN TIGER” PuzzleCan you find “THE HIDDEN TIGER” in the picture?Read More »
How did the teacher do so?Tom and Joe want to sit behind each other in class and the teacher arranges them so they are both ...Read More »
Magical WordThere is a word with five letters. Its last three letters refer to a skill of creating objects. Its middle ...Read More »
The Month RebusCan you guess the name of the month by looking at the below rebus?Read More »
Who is MurdererJohn, Jack and Jill are in a desert. John doesn’t like Jill and hence decides to murder him. He poisons ...Read More »
Catch the liarThere are two beautiful yet remote islands in the south pacific. The Islanders born on one island always tell the ...Read More »