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Archive for January, 2012

Leaving the exam 2

Posted by Chris under MathsChallenge (12 Responds)

Six students are sitting in a row of seating with an aisle at each end. The invigilator has instructed that students may leave as soon as they finish the examination.
If they finish in random order, what is the average number of students that will pass another when leaving?

Leaving the exam

Posted by Chris under MathsChallenge (8 Responds)

Six students are sitting in a row of seating with an aisle at each end. The invigilator has instructed that students may leave as soon as they finish the examination.
If they finish in random order, what is the probability that none of the students will have to pass by another student when leaving?

New Year party

Posted by Chris under Logic (12 Responds)

Here’s an oldie. I think it’s an excellent logic puzzle.
My wife and I invited four other couples to our New Year’s Eve bash. After yelling “Happy New Year!”, everyone either shook hands with or hugged each other. The couples only hugged each other.
When I asked everyone how many people they shook hands with, each [...]

The West coast line of the Antarctic

Posted by ragknot under Tom (4 Responds)

On TV I heard the western coast line of Antarctica was melting a lot of ice.   Isn’t each part of coast toward the North?
I soon knew which side was “west”, but then I realized, knowing which side is west could be a trick of mind.
If you can figure out this, then which would be [...]

A different Stack of the Deck

Posted by DP under Logic, MathsChallenge, Tom (11 Responds)

After some intense card games, Dave decides to order some pizza for the guys to split. Andy needs to use the restroom anyway, so they both get up from the card table. While Bob and Charlie are sitting there waiting for the others to return, Bob comes up with a quick game, and tells Charlie [...]

Stacked Deck (Part 2)

Posted by DP under MathsChallenge, Tom (13 Responds)

Andy, Bob, Charlie, and Dave are at it again. Now it is Andy’s turn to deal. For this game he decides to use only the J, Q, and K of each suit (Hearts, Clubs, Spades, and Diamonds). Andy will shuffle the modified deck then deal one card to Bob, then Charlie, then Dave, then himself, [...]

Find X

Posted by ragknot under Tom (13 Responds)

If you divide X  by 2 there will be a  remainder of 1.
If you divide X  by 3 there will be a  remainder of 1.
If you divide X  by 4 there will be a  remainder of 1.
If you divide X  by 5 there will be a  remainder of 1.
If you divide X  by 6 there will be a  remainder [...]

A very “LONG” word

Posted by ragknot under Tom (17 Responds)

This  “trick of mind” question should not be hard.  Anyone can add their own guess to the list.
We will determine the distance from the first letter to the last.
What word would you guess as the longest word?

Happy New Year

Posted by ragknot under Tom (16 Responds)

When things fall, their speed is limited by friction.  Weight increases the speed, but size generally increases friction.
What about sliding down a mountain?  It seems like that would be much slower than a  fall straight down.  Think about snow.
When it falls, it is very slow.  But I heard that avalanches slide  down a mountain at about 250 miles an [...]

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