Sets important formulas in one table

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2) If A is a set ,then the total number of subsets of A = 2ⁿ⁽ᴬ⁾

3)Proper Subset =( Total number of subsets - 1)  (or 2^n -1)

for example in the above example the total subset is 8 , therefore proper subset is = 8-1 i,e 7.

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Also n(AΔB) = n(A) + n(B) - 2n(A⋂B)

This formula is also important.

12) n(AUB) = n(A)+n(B) - n(A∩B)

13)