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here is one question my friend sent me. What can be the last two numbers' answers and can you also tell the logic, thanks

4072=1 3489=3 6517=1 9682=4 7678=3 1020=2 9345=? 9807=?

user3389920
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1 Answers1

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$9345 = 1$ and $9807 = 4$. One counts the number of circles made by the numerals. So a 0, 6 and 9 count as 1 and an 8 counts as 2.

B. Goddard
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