Final answer:
The set C includes the odd integers whose absolute value is less than 7; there are 6 such numbers.
Step-by-step explanation:
The set C is defined as y ∈ Z, y is an odd number and
To find the cardinality |C|, we need to determine the number of elements in the set.
Given the condition that |y| < 7, the possible values of y are -5, -3, -1, 1, 3, and 5. These are the odd numbers between -7 and 7.
Therefore, the set C = {-5, -3, -1, 1, 3, 5} and the cardinality |C| is 6.