A friend gave me this riddle, stating that it would be easy for children but hard for grown-ups.
Any combination of four digits has an determined value. Here are some examples (note, the position of the example is of no relevance):
0000 = 4
0001 = 3
1111 = 0
1234 = 0
2266 = 2
4068 = 4
6666 = 4
6088 = 6
7654 = 1
8888 = 8
8901 = 4
9966 = 4
9998 = 5
You may ask for any other four-digit number and there is a determined value for it as well. What is the value-function based upon?
Answer
The value is:
How many circles appear within the numbers
Explanation:
Each number corresponds with a value, and they are additive for the final value of the 4 digit string. 0, 6, and 9 map to 1. 8 maps to 2, everything else maps to 0. This value for each digit is the number of circles within the drawing of the digit
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