2
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Determine the missing item.

I I I I V V V V XV XV XV XV XVI XVI XVIII XVIII XVIII XVIII XIX XIX XX XX XX XX ?

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2
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I'll go with:

L

Since the sequence seems to be

1. Non-decreasing numerically as Roman numerals; and

2. Heading toward being palindromic in the number of strokes used


 I I I I V V V V XV XV XV XV XVI XVI XVIII XVIII XVIII XVIII XIX XIX XX XX XX XX L L L L C C C C
 1 1 1 1 2 2 2 2  4  4  4  4   5   5     7     7     7     7   5   5  4  4  4  4 2 2 2 2 1 1 1 1
 

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