This problem can be solved by pre-school children in 5-10 minutes, by programer – in 1 hour, by people with higher education … Well, check yourself.
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The answer has to do with how many circles are in each number. So the number 8 has two circles in its shape so it counts as two. And 0 is one big circle, so it counts as 1.
So 2581 = 2
