Write the set of all letters of the word **"SCHOOL"** in roster form.
A$\{S, C, H, O, O, L\}$
B$\{S, C, H, O, L\}$
C$\{S, C, H, L\}$
D$\{S, C, H, O\}$
Answer & Solution
Correct answer: B. $\{S, C, H, O, L\}$
In **roster form**, elements are listed once each — repetitions are **not** counted. The word *SCHOOL* uses six characters $S, C, H, O, O, L$ but only $5$ distinct letters: $S, C, H, O, L$.
- Trap A repeats $O$ — violates the no-repetition rule.
- Trap C omits $O$.
- Trap D omits $L$.
NCERT Class 11, Ch 1.2, Note: *while writing the set in roster form an element is not generally repeated*.
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