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In roster form an element that repeats is written:
ANot at all
BOnly once
CTwo times
DMany times
Answer & Solution
Correct answer: B. Only once
1. A set records only which objects belong to it.
2. Repeating a member adds nothing to that record.
3. So in roster form an element is not repeated.
_Source: NCERT Class 11 Mathematics, Chapter 1, Sets._
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