In today's notation of Roman numerals it is: XLIX.
But the Romans themselves would have calculated 49 on an abacus counting board as XXXXVIIII and probably simplified it to IL by placing I to both sides of tne numerals.
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The Roman numeral for 49 is 'XLIX'.
49 = XLIX
The Roman numeral of IL = -1+50 => 49
The number 49 is represented by the Roman numeral XLIX
74 = LXXIV 49 = XLIX