Final answer:
FALSE. Two sets A and B are said to be disjoint if they have no elements in common. In this case, since the element 'b' is present in both sets, A and B are not disjoint.
Step-by-step explanation:
Disjoint sets, also known as mutually exclusive sets, are sets that have no elements in common. In other words, two sets are disjoint if their intersection is the empty set.
Two sets A and B are said to be disjoint if they have no elements in common. In this case, set A = {a, b, c} and set B = {b, e, t}. Since the element 'b' is present in both sets, A and B are not disjoint. So, the statement 'A and B are disjoint' is false.