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Question

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

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Solution

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


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