If S = {Mon, Wed, Fri, Sun}, what is n(S)?
Answer and explanation
Correct answer: 4
The notation n(S) means the cardinality, or number of distinct elements, of set S. The set lists Monday, Wednesday, Friday, and Sunday, which are four different elements. Therefore n(S) = 4. The answer is not 7, because the set does not contain all days of the week, and order does not affect the count.
Frequently asked questions
What is the correct answer to this question?
4
Why is this the correct answer?
The notation n(S) means the cardinality, or number of distinct elements, of set S. The set lists Monday, Wednesday, Friday, and Sunday, which are four different elements. Therefore n(S) = 4. The answer is not 7, because the set does not contain all days of the week, and order does not affect the count.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Common Questions.
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