Question

The set of all letters of the word 'SCHOOL' is represented by
I. $\{S,C,H,O,O,L\}$
II. $\{S,C,H,O,L\}$
III. $\{C,H,L,O,S\}$
IV. $\{S,C,H,L\}$
The correct code is

• A. I and II
• B. I, II and III
• C. II and III
• D. I, II, III and IV

Answer 1

Answer: (C)

While writing the set in roster form, an element is not generally repeated, i.e., all elements are taken as distinct. The set of letters forming the word '$SCHOOL$' is $\{S,C,H,O,L\}$ or $\{H,O,L,C,S\}$. Here, the order of listing elements has no relevance. We can also express it as $\{S,C,H,O,L\}$.