Question

if X and Y are two sets such that XUY has 28 elements, X has 13 elements and y has 20 elements, how many elements does XNY have​

Answer 1

Answer:

It is given that:

n(X∪Y)=18,n(X)=8,n(Y)=15

n(X∩Y)=?

We know that:

n(X∪Y)=n(X)+n(Y)−n(X∩Y)

∴18=8+15−n(X∩Y)

⇒n(X∩Y)=23−18=5

∴n(X∩Y)=5

Step-by-step explanation:

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