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The text discusses a question on the application of Venn diagrams, where it is given that the number of elements in set A is 15, the number of elements in the union of sets A and B is 30, and the number of elements in the intersection of sets A and B is 7. By representing these sets with circles and recognizing that they have elements in common, the number of elements in set B can be determined using the Venn diagram. Set A and set B are two events, and the given information allows for the calculation of the number of elements in set B.