Give the Numbers of Elements in the Regions Marked I $$| U | = 1,000 , | A | = 50 , | B | = 250 , | A \cap B | = 30$$

Short Answer

Give the numbers of elements in the regions marked I, II, III, and IV in the figure. $$| U | = 1,000 , | A | = 50 , | B | = 250 , | A \cap B | = 30$$ I: __________ elements II: __________ elements III: __________ elements IV: __________ elements