Use counting to determine the whole number that corresponds to the cardinality of the set. \( A=\{7,9,11,13,15\} \) A. \( n(A)=5 \) B. \( n(A)=15 \) C. \( n(A)=4 \) D. \( n(A)=13 \)

To determine the cardinality of the set \( A = \{7, 9, 11, 13, 15\} \), we need to count the number of distinct elements in the set. 1. **Identify the elements in the set**: The elements are 7, 9, 11, 13, and 15. 2. **Count the elements**: - 7 (1) - 9 (2) - 11 (3) - 13 (4) - 15 (5) There are a total of 5 distinct elements in the set \( A \). Thus, the cardinality \( n(A) \) is 5. The correct answer is: A. \( n(A) = 5 \)