Question

write the number of element of the following set. A=(3,6,9,12,15,18,21)​

Answer 1

Answer:

n(A)=7

This the answer for this question friend :)

The number of elements of this set is expressed by 'n(A)'

Answer 2

Answer:

7

Step-by-step explanation:

Given set:

A = {3,6,9,12,15,18,21}

As we all know Set is the collection of the objects/elements

When we count the number of elements in the set A , say

3,6,9 . . . , 21, we are forming a 1-1 correspondence between the elements in the collection and the numbers in {1, 2, . . . , n}. This sort of counting gives us concept of what we call as cardinality. The set whose elements can be counted are known as finite set. The size of a finite set ( cardinality) is measured by the number of elements it contains. It is denoted by n(A).

Thus, n(A) = 7 .

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