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Please follow the below link for Union and Intersection Notes :
https://www.learnohub.com/revise-notes/JEE/JEE-Maths/Sets/17/644a100f26173354c6d1b92a
https://www.learnohub.com/revise-notes/JEE/JEE-Maths/Sets/18/644a100f26173354c6d1b92a