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This question already has an answer here:

8   = 2
68  = 3
91  = 1
32  = 0
883 = 4
761 = ?

What number should be instead of ? in this: 76 = ? according to other equations ?

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marked as duplicate by f'', Community Nov 20 '15 at 21:32

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1 - It's the number of closed loops in the number.

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