Final answer:
A subset of set B = {1, 3, 5, 7, 9, 11, 13} is a set that contains any combination of elements from set B, including the empty set or set B itself.
Step-by-step explanation:
If B = {1, 3, 5, 7, 9, 11, 13}, then a subset of B is any set that contains elements that are also in B, including the empty set and B itself.
For example, a possible subset of B could be {3, 7, 11}.
Other subsets include {}, {1, 5}, and {1, 3, 5, 7, 9, 11}, among others.
Every set has a number of subsets that can be found using the formula 2n where n is the number of elements in the set.
In this case, B has 7 elements, so it has 27 = 128 different subsets.