what is the rule?

Oct 2012
460
0
Hello!
Please, what is the rule?

8809=6 7111=0 2172=0 6666=4

1111=0 3213=0 7662=2 9313=1

0000=4 2222=0 3333=0 5555=0

8193=0 8096=5 7777=0 9999=0

7756=1 6855=3 9881=5 5531=0

2581= ?
 
Sep 2012
764
53
British Columbia, Canada
I've seen this before in a riddle book. I forgot where but I remember it clean and clear.

Just count how many "loops" are in the number.

*Edit* I think it should be 9999=4.
 
Oct 2012
460
0
Hello!
How do U mean"loops"? What shoudl be a "loop"?
Many thanks!
 
Sep 2012
764
53
British Columbia, Canada
ungeheuer said:
Hello!
How do U mean"loops"? What shoudl be a "loop"?
Many thanks!
I mean "loops" as in the closed curves each numbers have.

1,2,3,5, and 7 have no loops.
4,6,9, and 0 have 1 loop.
8 has 2 loops.
 
Jan 2014
30
0
MS, USA
eddybob123 said:
I've seen this before in a riddle book. I forgot where but I remember it clean and clear.

Just count how many "loops" are in the number.

*Edit* I think it should be 9999=4.
The book is known as "Impossible Riddles" Page 13 Question Number 4.

Hope this helped :) :)