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Old 09-02-2011, 07:31 PM #1
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Small Talk Brain Teaser

You have a set of 3 light switches outside a closed door. One of them controls the light inside the room. With the door closed from outside the room, you can turn the light switches on or off as many times as you would like.

You can go into the room - one time only - to see the light. You cannot see the whether the light is on or off from outside the room, nor can you change the light switches while inside the room.

No one else is in the room to help you. The room has no windows.

Based on the information above, how would you determine which of the three light switches controls the light inside the room?

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Old 09-02-2011, 07:34 PM #2
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Old 09-02-2011, 07:36 PM #3
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Why would that ever matter?
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Old 09-02-2011, 07:37 PM #4
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Turn two switches ON, and left one switch OFF. Wait 10 minutes. Then shut one of the ON switches OFF. One switch is ON and two are now OFF. Immediately go into the room. If the light is on, you know it's the switch that is still ON. If the light is off, feel the light bulb. If the bulb is cold, it's the light switch that you never turned ON. If the bulb is still warm but the light is off, it's the switch you turned ON but then turned OFF prior to entering the room.
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Old 09-02-2011, 07:40 PM #5
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Flip the first switch on for a couple minutes then turn it off. Immediately turn on the second switch and go into the room. If the light is on its the second switch. If if its off and the bulb is warm then its the first switch. If its off and cold then its the third switch.
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Old 09-02-2011, 08:16 PM #6
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Quote:
Originally Posted by USAFWD View Post
Flip the first switch on for a couple minutes then turn it off. Immediately turn on the second switch and go into the room. If the light is on its the second switch. If if its off and the bulb is warm then its the first switch. If its off and cold then its the third switch.
what if the light bulb is burned out
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Old 09-02-2011, 08:18 PM #7
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What if it's a fluorescent bulb?
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Old 09-02-2011, 08:22 PM #8
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Well what if the door was locked?
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Old 09-02-2011, 08:24 PM #9
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Quote:
Originally Posted by snoller View Post
Turn two switches ON, and left one switch OFF. Wait 10 minutes. Then shut one of the ON switches OFF. One switch is ON and two are now OFF. Immediately go into the room. If the light is on, you know it's the switch that is still ON. If the light is off, feel the light bulb. If the bulb is cold, it's the light switch that you never turned ON. If the bulb is still warm but the light is off, it's the switch you turned ON but then turned OFF prior to entering the room.
this, but more importantly what the **** are you doing back?
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Old 09-02-2011, 08:29 PM #10
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Is the light currently off? Do all switches start in the same position?
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Old 09-02-2011, 08:48 PM #11
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this, but more importantly what the **** are you doing back?
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Old 09-02-2011, 10:04 PM #12
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Take a knife and cut your hand rub the blood on the lightswitch to the right.
Marry the waitress.

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Old 09-02-2011, 10:29 PM #13
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Quote:
Originally Posted by snoller
Turn two switches ON, and left one switch OFF. Wait 10 minutes. Then shut one of the ON switches OFF. One switch is ON and two are now OFF. Immediately go into the room. If the light is on, you know it's the switch that is still ON. If the light is off, feel the light bulb. If the bulb is cold, it's the light switch that you never turned ON. If the bulb is still warm but the light is off, it's the switch you turned ON but then turned OFF prior to entering the room.
****
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Old 09-02-2011, 11:28 PM #14
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Quote:
Originally Posted by snoller View Post
Turn two switches ON, and left one switch OFF. Wait 10 minutes. Then shut one of the ON switches OFF. One switch is ON and two are now OFF. Immediately go into the room. If the light is on, you know it's the switch that is still ON. If the light is off, feel the light bulb. If the bulb is cold, it's the light switch that you never turned ON. If the bulb is still warm but the light is off, it's the switch you turned ON but then turned OFF prior to entering the room.
Quote:
Originally Posted by USAFWD View Post
Flip the first switch on for a couple minutes then turn it off. Immediately turn on the second switch and go into the room. If the light is on its the second switch. If if its off and the bulb is warm then its the first switch. If its off and cold then its the third switch.
both of these methods work equally well. The second one is the way I would do it.
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Old 09-02-2011, 11:29 PM #15
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This was on the do you have a legal mind game for the tv show SUITS on their USA site
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Old 09-02-2011, 11:33 PM #16
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Old 09-03-2011, 07:15 AM #17
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Flick on all the lights and devide by zero.

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Old 09-03-2011, 07:35 AM #18
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turn all of them on.
Walk in
Profit
When asked which one control's the light. Flip the person off and walk away.
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Old 09-03-2011, 07:40 AM #19
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Old 09-03-2011, 10:38 AM #20
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what if the light switches are opposite, on = off, and off = on
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Old 09-03-2011, 11:07 AM #21
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Originally Posted by snoller View Post
Turn two switches ON, and left one switch OFF. Wait 10 minutes. Then shut one of the ON switches OFF. One switch is ON and two are now OFF. Immediately go into the room. If the light is on, you know it's the switch that is still ON. If the light is off, feel the light bulb. If the bulb is cold, it's the light switch that you never turned ON. If the bulb is still warm but the light is off, it's the switch you turned ON but then turned OFF prior to entering the room.
beat me to it
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