Question

Write the number of element of the following set. *

A =(3,6,9,12,15,18,21)

5

6

7

8​

Answer 1

Answer:

6

Step-by-step explanation:

6 is the element of the following set

Answer 2

The number of elements of the set A = {3,6,9,12,15,18,21} is 7 (3rd option).

• In mathematics, when there is a collection of well-defined objects, we call it a set.
• In the roster notation of writing a set, we write the elements of the sets in between two curly brackets and a single comma separates every element in the set.
• The number of elements of a set is called Cardinality of the set.
• For the given set, there are 7 elements in the set. So the cardinality of set A is 7.

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