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Question

If X = { 1, 3, 5, 7}, then n(X) = _________.

A
4
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B
3
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C
2
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D
1
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Solution

The correct option is A 4
The number of elements in a set A is called its cardinal number and is represented by n(A) .
So here in X = {1, 3, 5, 7}, n(X) = 4.

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