Mental Floss

Brain Game: On a Count

By BY
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Math puzzle fans rejoice! It's your turn.

The following series represents the numbers 1 through 8 in a specific manner. Can you identify the 9th number in this sequence? 1, 2, 3, 2, 1, 2, 3, 4, ?

HERE is our solution.

THE ANSWER: 2.

The numbers represent the number of characters in Roman numerals, beginning with 1 (I).

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