$12 = 0$
$1234 = 1$
$123456 = 2$
$12345678 = 4$
$369 = 2$
$248 = 3$
$2 = 0$
$3 = 0$
$5 = 0$
$7 = 0$
$11 = 0$
$13 = 0$
What does:
$123456789 = ?$
Why?
Hopefully isn't too hard, please ask if you need any test cases.
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1$\begingroup$ Wow this was way too easy. Really should amp up the difficulty level $\endgroup$– qwertylpcJul 16, 2015 at 16:05
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1 Answer
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The answer is:
5
because
You're counting the number of holes in the numbers.
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$\begingroup$ @JLee Thanks. I didn't know how to do the hide thingy. $\endgroup$ Jul 16, 2015 at 16:08