kimyoyo637 kimyoyo637
  • 23-08-2021
  • Mathematics
contestada

if n(A) = 12, n(b) = 9 and n(AuB) = 16 then find the value of n (A-B)​

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Аноним Аноним
  • 23-08-2021

Question has a slight error .we should find n(A[tex]\cap[/tex]B)

  • n(A)=12
  • n(B)=9.
  • $n(A\cup B)=16$

[tex]\boxed{\sf n(A\cup B)=n(A)+n(B)-n(A\cap B)}[/tex]

[tex]\\ \rm\longmapsto n(A\cap B)=n(A)+n(B)-n(A\cup B)[/tex]

[tex]\\ \rm\longmapsto n(A\cap B)=12+9-16[/tex]

[tex]\\ \rm\longmapsto n(A\cap B)=5[/tex]

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