View Full Version : The Problem Solving Game

HelpDeskHustler

12-02-2008, 09:59 AM

This is like the "name the game" game in that a one person will post something, requiring another member to post the correct response to be given a turn to post something else. This however, isn't merely identification of a screenshot... this is solving a problem, so let's see who's got the smarts. Word problems, Math problems, logic... etc. Try not to post anything too hard or anything with too many right answers (in case you step away and a 3rd party needs to decide if you got it right) I'll start:

Given a function which produces a random(equal probability) integer in the range 1 to 5, describe function which uses the previous function to produces a random integer(with equal probability) in the range 1 to 7.

marvin-martian

12-02-2008, 09:48 PM

official homework help thread?

jim762

12-03-2008, 12:08 AM

Given a function which produces a random(equal probability) integer in the range 1 to 5, describe function which uses the previous function to produces a random integer(with equal probability) in the range 1 to 7.

HUH???:confused:

HelpDeskHustler

12-03-2008, 05:19 AM

fine. I'll post an easier one first. But no, marv this was a question from a google interview.

If you have a function that creates number 1-5 randomly, have it generate 7 numbers. Add those 7 numbers together. In order to give each number an equal probability: 35,28,21,14 = 7; 34,27,20,13=6; 33,26,19,12=5; 32,25,18,11=4; 31,24,17,10=3; 30,23,16,9=2; 29,22,15,8=1; if you get 7, have it restart until it doesn't get 7. 1-6 are impossible to "roll" with 7.

NEW QUESTION:

You have 8 balls that are equal in all ways, aside from one which has a slightly lower mass. Using a only an accurate balance for comparisons, how would you determine the ball with less mass with only two comparisons?

Solar

12-03-2008, 11:37 AM

Put 6 of the balls on the balance (3 each side).

A) If the balance is even: Compare the two of the remaing three balls

A-1) If the balance is even again: The third is lighter mass ball

A-2)If the balance is not even: The lighter ball is the ball with

the lightest mass.

B)If the balance is not even: Compare two of the three balls on the

lighter side.

B-1)If the balance is even: The third is lighter mass ball

B-2)If the balance is not even again: The lighter ball is the ball with the

lightest mass.

I hope I explained that correctly. I like that riddle. Where did you find it?

ferret15

12-03-2008, 11:49 AM

displacement

and

drop it from the same height

edit: nevermind. i see now. i read it too quick.

i have no clue i will think on that question

vikingshadow

12-03-2008, 12:43 PM

42

For both of the questions. The answer is ALWAYS 42.

HelpDeskHustler

12-04-2008, 08:13 AM

yea that's right solar. your turn now. And haha vike. I liked that reference.

XSiv Force

12-04-2008, 08:31 AM

. . .

. . .

. . .

Connect all the dots using 4 CONECTING lines. Lines must connect at ends in order for it to cosidered to only be 1

marvin-martian

12-04-2008, 08:52 AM

. .\ .

. . .\

. -.- .-

screw it

http://i447.photobucket.com/albums/qq192/KJL231/lulz.jpg

Solar

12-04-2008, 08:52 AM

http://thumb5.webshots.net/t/73/73/0/73/57/2619073570101580885peAodC_th.jpg (http://good-times.webshots.com/photo/2619073570101580885peAodC)

Scale of the dots is off but the idea is right.

EDIT: Good one marv...beat me to it!

New Question. If you have a 5 gallon Drum and a 3 Gallon Drum and unlimited amount of water how do you fill the 5 gallon drum with exactly 4 gallons?

marvin-martian

12-04-2008, 09:08 AM

fill 5 gallon drum

pour contents into 3 gallon drum until full

empty 3 gallon drum

pour the 2 gallons in 5 gallon drum into 3 gallon

fill 5 gallon drum

pour that into 3 gallon drum until thats full

you now have 4 gallons in the 5 gallon drum

XSiv Force

12-04-2008, 10:09 AM

got that off of die hard with a vengence didnt you :dodgy:

Solar

12-04-2008, 10:17 AM

maybe....:dodgy:

marvin-martian

12-04-2008, 10:25 AM

confirmation?

marvin-martian

12-04-2008, 11:21 AM

imagine this scenario.

ur making out with this girl. phone rings and says "get ur hand off my daughter" she says he dads dead.

then who was phone?

who was phone?

jim762

12-04-2008, 11:50 AM

mom

marvin-martian

12-04-2008, 02:15 PM

hooray!

DFSniper

12-04-2008, 03:15 PM

wow... that one seriously had me stumped!

HelpDeskHustler

12-05-2008, 05:15 AM

/4chan marv :p