"∩" is called the union symbol. It's commonly used in engineering. The intersection of sets ‘A’ and ‘B’ is the set containing the unique elements from both set ‘A’ and set ‘B’. Thus, to create an intersection, elements found in both original sets, which are the duplicates discarded by the union operation.
Each person received 1/4 of the sandwich. Simply divide 1 by 4 and you will get 0.25, either leave it in decimal form or convert it into fraction which is 1/4 because if you multiply 25 by 4 you will receive 1.
