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hello friends welcome to my channel math realization today we are going to see the formulas related to sets and especially on cardinal numbers okay so lets start your class so first we are going to see the formulas that are related to sets having only two subsets okay so lets start our formula so lets uh start with the formula n e union b where a and b are the subsets of universal set u and its formula is n a plus n b minus n a intersection b okay i i have said here a and b are the subset of u but to so in a diagram we have to draw two subsets like this okay and you can keep it inside the rectangle or square generally when you draw it may be a rectangle so lets keep them inside a rectangle okay so these are subsets e and b of universal set u so you have to write u at the corner this u represents universal set and a and b are the subsets of u and while we are drawing this figure please dont make contact with a and b of this line okay this line encloses a and b and please dont tou
