The Secret Santa Exchange
A group of ten friends decide to exchange gifts as secret Santas. Each person writes his or her name on a piece of paper and puts it in a hat. Then each person randomly draws a name from the hat to determine who has him as his or her secret Santa. The secret Santa then makes a gift for the person whose name he drew.
When it's time to exchange presents, each person walks over to the person he made the gift for and holds his or her left hand in his right hand.
What is the probability that the 10 friends holding hands form a single continuous circle?
When it's time to exchange presents, each person walks over to the person he made the gift for and holds his or her left hand in his right hand.
What is the probability that the 10 friends holding hands form a single continuous circle?
Hint: It's not as difficult as it seems.
It's the number of ways the friends can form a circle divided by the number of ways the names can be drawn out of the hat.
1/10
For a group of n friends, there are n! (n factorial) ways to draw the names out of the hat. Since a circle does not have a beginning and end, choose one person as the beginning and end of the circle. There are now (n-1)! ways to distribute the remaining people around the circle. Thus the probability of forming a single circle is
(n-1)! / n!
Since n! = (n-1)! * n (for n > 1), this can be rewritten as
(n-1)! / (n*(n-1)!)
Factoring out the (n-1)! from the numerator and denominator leaves
1/n
as the probability. Did you answer this riddle correctly?
YES NO
For a group of n friends, there are n! (n factorial) ways to draw the names out of the hat. Since a circle does not have a beginning and end, choose one person as the beginning and end of the circle. There are now (n-1)! ways to distribute the remaining people around the circle. Thus the probability of forming a single circle is
(n-1)! / n!
Since n! = (n-1)! * n (for n > 1), this can be rewritten as
(n-1)! / (n*(n-1)!)
Factoring out the (n-1)! from the numerator and denominator leaves
1/n
as the probability. Did you answer this riddle correctly?
YES NO
Santa And A Space Ship
Hint:
A Token Of Love Riddle
A thousand colored folds stretch toward the sky,
Atop a tender strand,
Rising from the land,
'Til killed by maiden's hand,
Perhaps a token of love, perhaps to say goodbye.
What am I?
Atop a tender strand,
Rising from the land,
'Til killed by maiden's hand,
Perhaps a token of love, perhaps to say goodbye.
What am I?
Hint:
Come For A Ride Riddle
Riddle me this
It goes up, but at the same time goes down. Up toward the sky, and down toward the ground. It's present tense and past tense too, come for a ride, just me and you. What is it?
It goes up, but at the same time goes down. Up toward the sky, and down toward the ground. It's present tense and past tense too, come for a ride, just me and you. What is it?
Hint:
Down The Chimney Riddle
Hint:
Sweet 16 Riddle
There is a man who is very rich. He has a daughter who is turning 16 and he wants to throw a party for her. He invited all the men in the kingdom. At the party the man invites everyone out to the pool. The pool is infested with salt water crocodiles. The rich man says, "Whoever can swim across this pool and come out alive, can either have 1 million dollars or marry my daughter." Then there was a splash! They looked over to see a man swimming across the pool with his clothes getting ripped apart. He gets to the end and jumps out. "Congratulations! Do you want to marry my daughter or $1,000,000! What did the man say?
Hint:
Neither. He wanted the name of the person that pushed him in. Did you answer this riddle correctly?
YES NO
YES NO
The One Story House Riddle
A drunk man came home riding in his car at night. Got to his home walked up the stairs in his one story house and turned off the light and fell asleep. When he woke up the next day he looked out the only window in the house and he saw something that scared him to death.
What scared him to death and how can he walk up on stairs in a one story house?
What scared him to death and how can he walk up on stairs in a one story house?
Hint:
How he can walk up stairs in a one story house is that he lived in a lighthouse and when he turned the only light off in the lighthouse all the boats crashed on the shore and he saw a boat coming toward him Did you answer this riddle correctly?
YES NO
YES NO
Santa's Transportation
Hint:
Elf Transportation Riddle
Hint:
Santas Favorite Sandwich
Hint:
Rivers With No Water Riddle
Hint: I represent an area of land or sea.
It Follows A River While Standing Still
Hint:
2 Fathers And 2 Sons Riddle
Hint:
One of the 'fathers' is also a grandfather. Therefore the other father is both a son and a father to the grandson.
In other words, the one father is both a son and a father. Did you answer this riddle correctly?
YES NO
In other words, the one father is both a son and a father. Did you answer this riddle correctly?
YES NO
Cowboy Rides Into Town On Friday
Hint:
I Am Up In The Sky
Hint:
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