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
Chocolate All Year Long
Hint:
A Lions Appetite Riddle
Hint:
Who Killed The Old Man Riddle
An old man lives alone in a house. Because of his age, he is not able to move comfortably and hence most of the things used to be delivered to his house.
On Friday while delivering the mail, the postman feels something suspicious in the house and tries to look inside through the key hole and he saw the blood filled body of the old man.
The police arrived the scene.
Outside the house, he found two bottles of warm milk, Tuesday newspaper, some unopened mail, and some gifts.
The police wasted no time to find the murderer.
Who killed the old man?
On Friday while delivering the mail, the postman feels something suspicious in the house and tries to look inside through the key hole and he saw the blood filled body of the old man.
The police arrived the scene.
Outside the house, he found two bottles of warm milk, Tuesday newspaper, some unopened mail, and some gifts.
The police wasted no time to find the murderer.
Who killed the old man?
Hint:
The newspaper delivery man, because there was no Wednesday, Thursday or Friday newspaper. He knew there was no one home to read it! Did you answer this riddle correctly?
YES NO
YES NO
The Long Island Iced Tea
Two guys walk into a bar. They both order the special, Long Island Iced Tea, which is poured from the same pitcher. One of them drinks his drink slowly and one of them drinks it fast. They walk outside and suddenly the guy who drank his Long Island Tea slowly drops to the ground and dies. They order an autospy and find that he died from poison. How could this be if the other guy drank the same tea and didnt even get sick?
Hint:
TTwo guys walk into a bar. They both order the special, Long Island Iced Tea, which is poured from the same pitcher. One of them drinks his drink slowly and one of them drinks it fast. They walk outside and suddenly the guy who drank his Long Island Tea slowly drops to the ground and dies. They order an autospy and find that he died from poison. How could this be if the other guy drank the same tea and didnt even get sick? Did you answer this riddle correctly?
YES NO
YES NO
Alone In The Woods Riddle
Hint:
Crossing The River Safely Riddle
A man is traveling with a fox and two chickens. If he leaves the fox alone with the chickens, the fox will eat the chickens. He comes to a river and needs to cross it. He finds a small boat that can carry only him and one animal. How does he get himself, the fox and two chickens across the river safely?
Hint:
Take the fox over, return with nothing. Go over with one chicken, return with the fox. Go over with the second chicken, return with nothing. Finally, take the fox over. Did you answer this riddle correctly?
YES NO
YES NO
20 Apples Riddle
There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?
Hint:
3 Or 4 Prongs Riddle
These riddles all rhyme
Theyre just like some songs
The next thing to find
Has three or four prongs.
Theyre just like some songs
The next thing to find
Has three or four prongs.
Hint:
Dating Men Riddle
Hint:
Making Eye Contact Riddle
Hint:
Cabin On The Mountain Riddle
There is a cabin on the side of a mountain. Three people are inside and they are dead. How did they die?
Hint:
They were killed in a plane crash The three people were the pilot, co-pilot, and navigator. They crashed in snow storm. Did you answer this riddle correctly?
YES NO
YES NO
Who Killed Samuel?
My name is Andy, and I will tell you a murderous tale.
On Friday, a murder took place at 4:21 a.m. The morning was calm with light rain. The body of Samuel was found in the dining room, however the murder happened in the kitchen. When the police arrived they could not find out the cause of death.
An autopsy was performed and ruled a natural death. Samuel was however poisoned by arsenic, an undetectable poison. His wife, 5'3" who leaves every night for work until 6 a.m, says she is sure that it was a suicide or suspects the butler. The butler happens to leave at 4 a.m everyday and returns at 6 p.m. The butler suspects the wife because she found pictures of her husband and another woman in her car. Who murdered the husband?
On Friday, a murder took place at 4:21 a.m. The morning was calm with light rain. The body of Samuel was found in the dining room, however the murder happened in the kitchen. When the police arrived they could not find out the cause of death.
An autopsy was performed and ruled a natural death. Samuel was however poisoned by arsenic, an undetectable poison. His wife, 5'3" who leaves every night for work until 6 a.m, says she is sure that it was a suicide or suspects the butler. The butler happens to leave at 4 a.m everyday and returns at 6 p.m. The butler suspects the wife because she found pictures of her husband and another woman in her car. Who murdered the husband?
Hint: There are three suspects.
The narrator, Andy. Both the wife and the butler suspect each other and have an alibi. Only Andy knows the name of the undetectable poison that killed Samuel. Did you answer this riddle correctly?
YES NO
YES NO
Same As My Neighbor Riddle
Cold and dark, I'm the same as my neighbor. Flatter than a pancake, faster than a panther. Lighter than a feather I still prevail, Yet a million mean trying to lift me would fail. Expanding and shrinking throughout the day, When heat is highest, underneath I lay. I leave in the darkness of the night, And don't come back if there's rain in sight. What am I?
Hint:
The Same Tea Riddle
A woman was horrified to find a fly in her tea. The waiter took her cup and went into the kitchen and returned with a fresh cup of tea. She shouted, "You brought me the same tea!" How did she know?
Hint:
Sugar. She had already put sugar in it and when she tasted the new tea it was already sweet. Did you answer this riddle correctly?
YES NO
YES NO
Add Your Riddle Here
Have some tricky riddles of your own? Leave them below for our users to try and solve.