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Question

The cardinal number of A={(x:x=5n,nW,n<4} is ___.

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Solution

Given the set A={(x:x=5n,nW,n<4}.

n can take values of 0, 1, 2 and 3.

Thus, the elements of A are 5×0,5×1,5×2 and 5×3.

A={0,5,10,15}

n(A)=4


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