The cardinal number of the set A = {3, 2, 2, 1, 3, 1, 2} is

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Solution

The correct option is B 3
Given A = {3, 2, 2, 1, 3, 1, 2}
Each element of a set is written only once.
Hence, Set A = {1, 2, 3}
$\Rightarrow$ n(A) = 3
The cardinal number of the given set is 3.

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