State cardinal number for following set.
$D = {l e t t e r s o f w o r d' I N T E R N A T I O N A L'}$

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Solution

cardinal number :-
The number of elements in a finite set is called cardinal number. It is denoted by $n (D)$ .
letters of word $' I N T E R N A T I O N A L'$ are $I, N, T, E, R, A, O, L$ .
i.e. There are $8$ elements in given set.
$\Rightarrow n (D) = 8$
Therefore, the cardinal number for following set is $n (D) = 8$

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