Question

The number of distinct elements in a given set A is called the ___ of A.

Answer 1

The number of distinct elements in a given set A is called the cardinal number of A. It is denoted by n(A).

For example:

• A {x : x ∈ N, x < 5}

A = {1, 2, 3, 4}

Therefore, n(A) = 4

• B = set of letters in the word ALGEBRA

B = {A, L, G, E, B, R}

Therefore, n(B) = 6