If X, Y, & Z are three pairwise disjoint sets then ∣X∪Y∪Z∣=∣X∣+∣Y∣+∣Z∣Prove ∣A∪B∣=∣A∣+∣B∣−∣A∩B∣
Full ans ?If X, Y, & Z are three pairwise disjoint sets then ∣X∪Y∪Z∣=∣X∣+∣Y∣+∣Z∣
∣(A∖B)∣=∣A∣−∣A∩B∣
If you understand that the show that (A∪B)=(A∖B)∪(B∖A)∪(A∩B)
Full [answer] ?
Look up into your text book for "elementary set theory". This is a rudimentary theorem - every text book that I know of states it and proves it.Prove ∣A∪B∣=∣A∣+∣B∣−∣A∩B∣