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# KCC's Quizzes: Strange Coding

A special coding is used to compress 4-digits numbers into one. Can you crack it by giving the value for the last number (in red)?

 8809 = 6 5555 = 0 7111 = 0 8193 = 3 2172 = 0 8096 = 5 6666 = 4 1012 = 1 1111 = 0 7777 = 0 3213 = 0 9999 = 4 7662 = 2 7756 = 1 9313 = 1 6855 = 3 0000 = 4 9881 = 5 2222 = 0 5531 = 0 3333 = 0 2581 = ?

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[edited by: emassa at 8:41 PM (GMT -4) on 13 Mar 2023]
• Thanks Gaetano for the detailed explanation! We will confirm in a couple of days!

• Thanks Nikhil for your feedback! We will confirm soon all the answers!

• You are thus correct Mark, congratulations!

• OK, it's time now to publish the right (and official) answer for this strange coding puzzle. Answer is 2

Well, this quiz can be seen as both the most complex and the most simple quiz ! All depends on how our brain is tuned... For example there are very skilled engineers who are still trying to put complex equations to (try) to crack the coding and then we have schoolchildren who see the answer in few seconds... Here the answer for 2581 is just 2. The "decoding" is ultra simple: just count the number of close loops in the numbers. 0, 6, P have one close loop, 8 has 2 loops and 1, 2, 3, 5, 7 have no loops at all. One can hesitate with 4 because it can be written with a close or open loop... But notice in our quiz here, 4 never appears...

Big applause for our 4 first winners:

Mark Cee, Perry Tsao, Eric O'Donnell and Gaetano Piarino

• Code for 2581 would be 2.

Logic: Count the number of circular shapes in all the digits.

• Bingo Rahul! That's the answer; no need to try to find complex equations...

And be ready for our next coming quiz!

• Answer will be 2 because in 8809 there are 2 round figure in 8 and 1 in 9 and 1 in zero so total will be 2+2+1+1 and in 7111 there are zero round so we can conclude that in 2581 there will be 2 round circle.

• Congratulation Sona, that's the answer! As you can see, sometime things can appear much more simple than one might think...