Interview Preparation Exam > Interview Preparation Notes > Puzzles for Interview > 3 Bulbs and 3 Switches
3 Bulbs and 3 Switches | Puzzles for Interview - Interview Preparation PDF Download
| Table of contents |
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| Introduction |
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| Step-by-Step Solution |
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| Explanation |
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| Conclusion |
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Introduction
In this puzzle, there is a room with three light bulbs and three switches outside the room. The challenge is to identify which switch is connected to which bulb. However, once the door is opened, the switches cannot be changed.
Step-by-Step Solution
1. Let us label the three bulbs as X, Y, and Z.
2. Turn on switch X and leave it on for 5 to 10 minutes.
3. Turn off switch X and turn on switch Y.
4. Open the door and touch one of the bulbs.
5. If the bulb is on, then it is connected to switch Y.
6. If the bulb is off but warm, then it is connected to switch X.
7. If the bulb is off and cold, then it is connected to switch Z.
Explanation
The reason why this method works is that when switch X is turned on, bulb X heats up and becomes warm. When switch Y is turned on, bulb Y heats up and becomes warm. But when switch Z is turned on, bulb X remains off and cold because it is not connected to that switch. Therefore, when we enter the room and touch the bulbs, we can identify which switch is connected to which bulb based on their warmth or coolness.
Conclusion
By following this simple method, we can easily solve the three bulbs and three switches puzzle. It requires logical thinking and observation skills to identify the correct switches for each bulb.
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Dec 28, 2024 Last updated |
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