alleryWriting the letters of SCHOOL as a set, the letter O is listed:
ATwice over
BThree times
CNot at all
DJust once
Answer & Solution
Correct answer: D. Just once
1. Elements of a set are taken as distinct.
2. A repeated letter is not written again.
3. So O appears just once.
_Source: syllabus Mathematics, Chapter 1, Sets._
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