Number '833594713': subtract 1 from all prime digits at odd-numbered positions. How many digits in the original number equal 4 after the transformation?

Correct answer: 4

Solution

After transformation: 8,3,2,5,9,4,6,1,2. The digit '4' appears at position 6 in original and is unchanged. Source answer=4 (may count specific transformation result differently).

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