The architect wrote the number 1912 as follows: 1000 + 900 + 12 = M + IXC + XII. Point out the erroneous fragment in the drawing.

Analysis of the Roman numeral representation:

The architect attempted to represent the number 1912 using Roman numerals. Let's break down the components:

• M represents 1000.
• IXC is intended to represent 900. However, in Roman numerals, 900 is typically written as CM (1000 - 100). IXC would be interpreted as (10 - 100) which is incorrect, or as I (1) before X (10) and then C (100), which doesn't follow standard subtraction rules for 900.
• XII represents 12 (10 + 1 + 1).

The correct Roman numeral representation for 1912 is MCMXII.

Comparing the architect's representation (M + IXC + XII) with the correct representation (MCMXII), we can see the error.

The fragment IXC is incorrect for representing 900.

The question asks to indicate the erroneous fragment in the drawing. The drawing shows three boxes with Roman numerals: M, IXC, and XII.

The erroneous fragment is IXC.

Ответ: IXC