find the cardinal number of the set {x:x€N,x≤7
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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.
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A={1,2,3,4,5,6,7}
n(A) =7
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