Question

Which of the following are not correctly matched?
A. \[I=7\]
B. \[X=10\]
C. \[V=2\]
D. \[XII=12\]

Answer 1

Hint: In the given question, we are given roman numerals. And we have to find which roman numeral is not written correctly with respect to the number equated to it. So, we will be considering each of the options and will check if it is written correctly.

Complete step by step solution:
According to the given question, we are given a question based on roman numerals. We are asked to check which of the options is/are incorrect.
Roman numbers refer to the representation of the numbers in Latin alphabets. it originated in Rome, hence the name Roman numerals. There is a unique way to represent each of the numbers. We will take each of the options and check them one by one.
First, we have,
A. \[I=7\]
It is incorrect because \[I=1\] and that 7 is represented by \[VII=7\].
So, this option is not true.
Next, we have,
B. \[X=10\]
This option is correct as 10 is represented by the symbol \[X\].
Next, we have,
C. \[V=2\]
This option is not correct as 2 is represented by the symbol \[II\]. The given option shows the symbol \[V\]. This represents the number 5. So, this option is not true.
Next that we have is,
D. \[XII=12\]
This option is correct as 12 is represented in roman numerals as \[XII\]. Therefore, this option is correct.
Therefore, the options which are not correct are, option A and option C.

Note: In roman numerals, the symbols if written in front of another symbol that means additions of those numbers and if the symbol is written before another symbol, it means subtraction.
For example – 5 is written in roman numbers as \[V\], that is, \[V=5\].
If we add \[I\], which is the roman number for 1, written after \[V\], we get, 6, that is, \[VI=6\].
And if \[I\] is written before \[V\], then, we get, \[IV=4\].