Question

The cardinal number of set B=[1, 4,9,17] ​

Answer 1

Answer:

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Cardinal Number of a Set

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What is the cardinal number of a set?

The number of distinct elements in a finite set is called its cardinal number. It is denoted as n(A) and read as ‘the number of elements of the set’.

For example:

(i) Set A = {2, 4, 5, 9, 15} has 5 elements.

Therefore, the cardinal number of set A = 5. So, it is denoted as n(A) = 5.

(ii) Set B = {w, x, y, z} has 4 elements.

Therefore, the cardinal number of set B = 4. So, it is denoted as n(B) = 4.

(iii) Set C = {Florida, New York, California} has 3 elements.

Therefore, the cardinal number of set C = 3. So, it is denoted as n(C) = 3.

Answer 2

Answer:

Given,

B={1,4,9,17}

=》The number of elements present in a set is called as the cardinal number.

Here, set B contains 4 elements. So, the cardinal number of set B is 4.

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