Question

If X and Y are two sets X UY has 20 elements. X has 17 elements and Y has 10 elements, how many elements X nY has?
please answer it ​

Answer 1

Answer:

18

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Answer 2

Answer:

Answer:

X U Y = 50

\begin{gathered}x = 28 \\ y = 32 \\ \end{gathered}

x=28

y=32

X ∩ Y =?

n(x U y)=n(x)+n(y)- n(X ∩ Y)

50=28+32-n(X ∩ Y)

50-28-32=-n(X ∩ Y)

-10=-n(X ∩ Y)

therefore X ∩ Y= 10