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Idea of a Set

If A= X | X...

Question

If $A = {X | X}$ is a letter in the word "ACCOUNTANCY", then cardinality of $A$ is

A

5

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B

6

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C

7

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D

8

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Solution

The correct option is C $7$
Non repeated letters in the word ACCOUNTANCY define the set $A$ .
$A \equiv {A, C, O, U, N, T, Y}$ .
$∴ n (A) = 7$ .

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