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Solution

Correct Option: 3

Product of digits:

431: 4 x 3 x 1 = 12

162: 1 x 6 x 2 = 12

831: 8 x 3 x 1 = 24

232: 2 x 3 x 2 = 12

All other numbers have product of digits equal to 12, but 831 has 24. So 831 is the odd one out.

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