Archive for the 'Puzzles' Category

02
Jan
10

Pinocchio’s Paradox ….. ;)

Pinocchio's Paradox

For those people, who don’ t know Pinnochio, he is a fairy tale character. The specialty of this kid is that when ever he lies, his nose will grow longer.

Look at the picture carefully….

Some people, after looking at the picture, will say : Ah, cute kid…… so nice …… and then closes the window …. 😛

and then don’t recognize the beauty of the logic  inside the photo.

PS : – If you are still not getting the greatness of the photo…. Ask these questions yourself.

  1. What will happen when Pinocchio lies ? Ans : His nose grows
  2. What will happen when he speaks truth ?  Ans : nothing happens
  3. Now try to figure out whether this statement is true or false : ” Now my nose will Grow ” …….
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21
Dec
09

Solutions to WU’s puzzles and riddles : PARTY HANDSHAKES (medium)

Party Handshakes

I am trying to find all the solutions and put them together at a single place, So feel free to add comments and if you have a solution please do post. Cheers … 🙂

Here is the puzzles link : http://www.wuriddles.com/

Question :

The master of a college and his wife has decided to throw a party and invited N guest and their spouses. On the night of the party, all guests turned up with their spouse, and they all had a great time. When the party was concluding, the master requested all his guests (including his wife, but not himself) to write down the number of persons they shook hands with, and to put the numbers in a box. When the box was opened, he was surprised to find all integers from 0 to 2N inclusive.

Assuming that a person never shake hands with their own spouse and that no one lied, how many hands did the master shake?

21
Dec
09

Solutions to WU’s puzzles and riddles : SPRINKLER AND PUMP (medium)

Spinkler

I am trying to find all the solutions and put them together at a single place, So feel free to add comments and if you have a solution please do post. Cheers … 🙂

Here is the puzzles link : http://www.wuriddles.com/

Question :

Take one of those spinning sprinklers everyone has seen before, the kind that has two pipes sticking out with the ends slightly bent to the side in opposite directions. Let’s say the sprinkler normally turns clockwise when shooting water. Hook a hose from the sprinkler to a water pump. Submerge the sprinkler in water, so that now when you turn on the pump, water is drawn through the sprinkler’s pipes. What happens to the sprinkler?

Note: From Surely You’re Joking, Mr. Feynman! by Richard Feynman. Originally a problem hotly debated among Princeton physicists in the 1940s. Feynman resolved the problem by conducting an experiment that resulted in the shattering of a glass tank and ultimately getting banned from a lab.

21
Dec
09

Solutions to WU’s puzzles and riddles : SOLDER CUBE (medium)

Cube

I am trying to find all the solutions and put them together at a single place, So feel free to add comments and if you have a solution please do post. Cheers … 🙂

Here is the puzzles link : http://www.wuriddles.com/

Question :

Say you have some bendable wires (any number, any length). What is the minimum number of solder connections needed to make a cube? Prove it.

Also, what is the minimum number of wires necessary? Prove it.

21
Dec
09

Solutions to WU’s puzzles and riddles : BUS PASSENGERS (medium)

The Bus Stop

I am trying to find all the solutions and put them together at a single place, So feel free to add comments and if you have a solution please do post. Cheers … 🙂

Here is the puzzles link : http://www.wuriddles.com/

Question :

The UC Berkeley bus had a minimal number of passengers. When it arrived at Telegraph Avenue, 3/4 of the passengers got out, and 7 people got on. At the next two stops, Shattuck and Hearst, the same thing happened. How many got off at Hearst?

21
Dec
09

Solutions to WU’s puzzles and riddles : Broken Clock (medium)

The Broken Clock

I am trying to find all the solutions and put them together at a single place, So feel free to add comments and if you have a solution please do post. Cheers … 🙂

Here is the puzzles link : http://www.wuriddles.com/

Question :

My fancy new digital alarm clock is broken! The time ‘jumps’ around.

When I reset it, it reads 12:00:00. Then it runs as it should, but after 12:04:15 it resets back to 12:00:00. It counts up to 12:04:15 again and then it jumps to … 12:08:32 ! Weird stuff. Do you know what’s wrong with my alarm clock?

21
Dec
09

Solutions to WU’s puzzles and riddles : Prisoner Dilemma Redux (medium)

Prisoner's Dilema

I am trying to find all the solutions and put them together at a single place, So feel free to add comments and if you have a solution please do post. Cheers … 🙂

Here is the puzzles link : http://www.wuriddles.com/

Question :

You and your partner in crime are both arrested and questioned separately. You are offered a chance to confess, in which you agree to testify against you partner, in exchange for all charges being dropped against you, unless he testifies against you also. Your lawyer, whom you trust, says that the evidence against both of you, if neither confesses, is scant and you could expect to take a plea and each serve 3 years. If one implicates the other, the other can expect to serve 20 years. If both implicate each other you could each expect to serve 10 years. You assume the probability of your partner confessing is p. Your highest priority is to keep yourself out of the pokey, and your secondary motive is to keep you partner out. Specifically you are indifferent to you serving x years and your partner serving 2x years. At what value of p are you indifferent to confessing and not confessing?




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