Because according to today's rules governing the Roman numeral system 49 is XLIX
But the Romans themselves would have probably wrote it out as IL (-1+50=49)
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The Roman numeral of IL = -1+50 => 49
The Roman numeral for 49 is 'XLIX'.
Nowadays 49 as a Roman numeral is notated as XLIX but the ancient Romans would have probably notated 49 as XXXXVIIII and abridged it to IL
I is 1 and L is 50. Because the I is before the L you subtract making 49. The proper way of representing 49 in Roman numerals is XLIX.
49 = XLIX