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Sum
Find the cardinal number of the following sets:
A2 = {x : x ∈ N and 3 ≤ x <7}
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Solution
A2 = {x : x ∈ N and 3 ≤ x <7}
= {3, 4, 5, 6}
∴ Cardinal number of set A2 = 4
Concept: Cardinal Number of a Set
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