Safely Across The Stream
A farmer was going to town with a fox, a goose and a sack of corn. When he came to a stream, he had to cross in a tiny boat, and could only take across one thing at a time. However, if he left the fox alone with the goose, the fox would eat the goose, and if he left the goose alone with the corn, the goose would eat the corn. How does he get them all safely over the stream?
Hint:
He takes the goose across first, then comes back. Then he takes the fox across and brings the goose back. Then he takes the corn over. Finally he comes back alone and takes the goose across. Did you answer this riddle correctly?
YES NO
YES NO
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
The Safest Room
Hint:
They'd both be safe because the lions that havent eaten in 3 months would be dead. Did you answer this riddle correctly?
YES NO
YES NO
How Many Times A Day?
Hint:
22 times: 12:00:00, 1:05:27, 2:10:55, 3:16:22, 4:21:49, 5:27:16, 6:32:44, 7:38:11, 8:43:38, 9:49:05, 10:54:33. Each twice a day. Did you answer this riddle correctly?
YES NO
YES NO
Keeping The Time
Hint:
Who Is This Traveler?
A traveler starts a journey. For the first week he goes east. The second he goes in all directions. The third he flies up into the sky. In the fourth he comes back down. Who is the traveler?
Hint:
An iceberg - travels East as an iceberg, free flowing water when melted, flies up to sky when evaporated, falls back down as rain. Did you answer this riddle correctly?
YES NO
YES NO
Digging In The Sand Riddle
Hint:
Time For The Dentist Riddle
Hint:
Time For Elephants Riddle
Hint:
The Witch That Tells Time
Hint:
Fox And Goose Riddle
How does he get all safely over the stream?
Hint:
Take the goose over first and come back. Then take the fox over and bring the goose back. Now take the corn over and come back alone to get the goose. Take the goose over and the job is done! Did you answer this riddle correctly?
YES NO
YES NO
Elephant On Time Tiddle
Hint:
Coming And Going Riddle
Hint:
Rabbit Travel Riddle
Hint:
Traveling A Great Distance
How do you travel a great distance without letting your feet touch the ground, while never leaving it?
Hint:
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