## Short, but challenging, logic puzzle

You’ll need the full powers of your working memory for this one, courtesy of www.braingle.com:

There is a very special five digit number. The special thing about it is that its first digit describes how many 0s there are in the whole number, the second digit describes how many 1s there are in the whole number, and so one, all the way to the fifth digit describing how many 4s there are in the big number

will post the answer in the comments section in 1-2 days

Tags: working-memory

RLP| Profile December 9th, 2006 - 12:15 amThe number is 21200.

There are 2 zeroes, 1 one, 2 twos, 0 threes and 0 fours.

lowtec| Guest December 10th, 2006 - 4:32 pm40000 works also…

Nerd| Guest December 12th, 2006 - 6:47 amno, 4000 does not work, because the 5th digit is the number of the 4-s

Scott K.| Guest January 10th, 2007 - 8:25 pmI feel dumb after that. I was going to say 14111, but it just goes to show, I can’t take a guess based on just the first 2 numbers working, I have to think it the full way through.

Kelby B.| Guest January 12th, 2007 - 5:39 pmAnother answer would be 31000.

Megan W| Guest January 14th, 2007 - 4:34 amKelby, 31000 doesn’t work because there would have to be a 1 to represent the number of 3s. i.e 31010 – but this then means there are 2 1s. hence making it an incorrect answer.

21200 is the only correct answer.

DrNumlock| Guest January 16th, 2007 - 10:05 amStart with: 4 0 0 0 0

Wich is wrong.

Correct it: 4 0 0 0 1

wich is wrong

Correct it: 3 0 0 0 1

the answer is close, but not right.

Correct it: 3 0 0 1 0

I cant find any flaws. so i call it right.

Dr.Numnut| Guest January 18th, 2007 - 3:30 pmDr. Numlock there is a flaw in your theory in the # 30010 the 2nd digit would represent how many 1′s are in the 5-digit #,ur # states 0 and u have one #1 in ur 5-digit # i think 21200 is the only correct answer

max| Guest January 18th, 2007 - 9:30 pmScott K. (above) is my dad. i am his 13 year old son. he couldnt get the answer no matter how hard he tried. he worked on it for a good 25-30 minutes. i then took it up to my room and figured it out in about 5 minutes. my dad is a very smart lawyer, so this has to just be how your individual brain thinks logically. i probably embarassed him by saying all this, so sorry dad!