Question

In the Roman numeral, I can be subtracted from:
(A) V and X
(B) M only
(C) V only
(D) None

Answer 1

Hint:The symbols V, L and D are never written to the left of a symbol of greater value i.e. V, L and D are never subtracted and repeated.
IX cannot occur to the left of X.
A symbol is not repeated more than three times.
In this question use the subtraction rule.
The integers are represented by the following letters:
I$ = 1$
V$ = 5$
X$ = 10$
L$ = 50$
C$ = 100$
D$ = 500$
M$ = 1000$

Complete step-by-step answer:
By using subtraction rule
Writing a smaller number to the left of a large number which means that the smaller number has to be subtracted from the large number.
The symbol (I) which is equal to $1$ can be used for subtraction from (V) and (X) only which is equal to $5$ and $10$ respectively. The symbol X can be subtracted from L and C only.
I$ = 1$, X$ = 10$, C$ = 100$
V$ = 5$ , L$ = 50$
$ \Rightarrow $I can be subtracted from V and X only
$\therefore $Hence, the answer is V and X.
So, the option A is correct.

Note:
Before solving the question we should have to follow all of the rules for writing Roman numerals.
All the rules area as follows:-
1)If a smaller digit is placed between two larger digits, then the smaller digit is always to be subtracted from the right sided larger digit.
2)V, L and D are never repeated.
3)A smaller digit is to be added when it is placed just after the larger digit and is to be subtracted when it is placed on the left of the larger digit.
4)The digits V, L, D and M are not subtracted from any digits.
5)The value of digits is increased by 1000 times if a bar is placed over the digit.
6)The left digit of each pair below can be subtracted only once from the right digit.