The 100 Seat Airplane
People are waiting in line to board a 100-seat airplane. Steve is the first person in the line. He gets on the plane but suddenly can't remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it's available, otherwise they will choose an open seat at random to sit in.
The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?
The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?
Hint: You don't need to use complex math to solve this riddle. Consider these two questions:
What happens if somebody sits in your seat?
What happens if somebody sits in Steve's assigned seat?
The correct answer is 1/2.
The chase that the first person in line takes your seat is equal to the chance that he takes his own seat. If he takes his own seat initially then you have a 100% chance of sitting in your seat, if he takes your seat you have a 0 percent chance. Now after the first person has picked a seat, the second person will enter the plan and, if the first person has sat in his seat, he will pick randomly, and again, the chance that he picks your seat is equal to the chance he picks someone your seat. The motion will continue until someone sits in the first persons seat, at this point the remaining people standing in line which each be able to sit in their own seats. Well how does that probability look in equation form? (2/100) * 50% + (98/100) * ( (2/98) * 50% + (96/98) * ( (2/96) * (50%) +... (2/2) * (50%) ) ) This expansion reduces to 1/2.
An easy way to see this is trying the problem with a 3 or 4 person scenario (pretend its a car). Both scenarios have probabilities of 1/2. Did you answer this riddle correctly?
YES NO
The chase that the first person in line takes your seat is equal to the chance that he takes his own seat. If he takes his own seat initially then you have a 100% chance of sitting in your seat, if he takes your seat you have a 0 percent chance. Now after the first person has picked a seat, the second person will enter the plan and, if the first person has sat in his seat, he will pick randomly, and again, the chance that he picks your seat is equal to the chance he picks someone your seat. The motion will continue until someone sits in the first persons seat, at this point the remaining people standing in line which each be able to sit in their own seats. Well how does that probability look in equation form? (2/100) * 50% + (98/100) * ( (2/98) * 50% + (96/98) * ( (2/96) * (50%) +... (2/2) * (50%) ) ) This expansion reduces to 1/2.
An easy way to see this is trying the problem with a 3 or 4 person scenario (pretend its a car). Both scenarios have probabilities of 1/2. Did you answer this riddle correctly?
YES NO
The Uncharted Island Riddle
A plane containing 5 people crashes into an uncharted island, and all of them survive for a limit of 5 days. 2 of them build themselves graves and die in it from the hard work. 1 person fills one of the graves with dirt and then dies next to it on day 3. The last two people build 3 graves, and put in one of the corpses, but 5 years later, 11 people are not in their graves, yet the graves are full of corpses. How?
Hint:
On day four, the last two survivours(who are different sexes)found food which will last each of them 4 more years, and on the fifth day, they began reproducing. By the fourth year, ten children have been taught how to raise themselves. The children were thoughtful and put their corpses in the grave. Did you answer this riddle correctly?
YES NO
YES NO
Every Single Person Riddle
Hint:
The married people are still alive because every SINGLE person dies. Did you answer this riddle correctly?
YES NO
YES NO
The Claustrophobic Train Ride
A train just leaves a station and enters a tunnel. Where is the best place for a claustrophobic person to sit?
Hint:
In the back. See, the train is still accelerating as it is leaving the station so the train will be moving faster when the back of the train enters the tunnel. Did you answer this riddle correctly?
YES NO
YES NO
Dangerous Chemicals Riddle
There is a chemical that is very dangerous. If this chemical is inhaled, it may be fatal. Under certain conditions, contact with the skin can cause a burn. However, once a person's body becomes dependent on this chemical, prolonged separation from this chemical can cause death. However, even though many people know of this chemical, and it is found in nearly every drinking source, nothing is being done to try to get rid of it. Why is nothing being done about this chemical?
Hint: This is a real chemical. Think about everything that is being said.
No one does anything about it because the chemical is water. Did you answer this riddle correctly?
YES NO
YES NO
Without A Father Riddle
Hint:
Hurricane Conversation Riddle
Hint:
Farm Secrets Riddle
Hint:
Powered By Love Riddle
I'm the one person who does the work of twenty for free. I'm powered by love, fueled by coffee and sustained by wine. Who am I?
Hint:
I Am Old But Also New
I am old but also new
I may seem rather strange but all of me is true
I am 66 inside but really only 1
I can be pocket-sized or sometimes weigh a ton!
All of me is about a person you really ought to meet
He often signs his name and each story is his treat
I am a world best seller but sadly seldom read
Perhaps you've seen me on a shelf or lying by a bed?
What am I?
I may seem rather strange but all of me is true
I am 66 inside but really only 1
I can be pocket-sized or sometimes weigh a ton!
All of me is about a person you really ought to meet
He often signs his name and each story is his treat
I am a world best seller but sadly seldom read
Perhaps you've seen me on a shelf or lying by a bed?
What am I?
Hint:
Personality Snake Riddle
Hint:
A World's Best Seller Riddle
I am old but also new
I may seem rather strange but all of me is true
I am 66 inside but really only 1
I can be pocket sized or sometimes weigh a ton!
All of me is about a person you really ought to meet
He often signs his name and each story is his treat
I am a world best-seller but sadly seldom read
Perhaps you've seen me on a shelf or lying by a bed?
What am I?
I may seem rather strange but all of me is true
I am 66 inside but really only 1
I can be pocket sized or sometimes weigh a ton!
All of me is about a person you really ought to meet
He often signs his name and each story is his treat
I am a world best-seller but sadly seldom read
Perhaps you've seen me on a shelf or lying by a bed?
What am I?
Hint:
Running A Race Riddle
Hint:
You're in second place. You didn't pass the person in first. Did you answer this riddle correctly?
YES NO
YES NO
You Sometimes Do It With Yourself
You get a lot of it if youre powerful and successful, but significantly less when youre just starting out. You sometimes do it with yourself, but its a lot better when you do it with another person. What am I talking about?
Hint:
Always Riding Piggy Back Riddle
I take your books from home to school.
Im red or blue or green or black.
You zip my zippers here and there.
Im always riding piggy back.
Im red or blue or green or black.
You zip my zippers here and there.
Im always riding piggy back.
Hint:
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