Question:

What is the Cardinal number n(A)?

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Find the Cardinal number n(A) for the set A such that A = {x | x is a number on a clock face}

a. n(A) = 6

b. n(A) = 24

c. n(A) = 3

d. n(A) = 12

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  1. for a layman,

    n(A) is the number of elements in the set A

    if you mean a clock with 1,2,...12 written on it n(A) will be 12

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