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5 of the people on John's street know how to roller skate. 8 people know how to swim, and 3 people know both how to roller skate and how to swim. How many people know how to roller skate or how to swim or both?

Respuesta :

  • A=people know how to roller skate
  • B =People know to swim
  • A intersection B=People know both
  • A union B=total people

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

[tex]\\ \sf\longmapsto 5+8-3[/tex]

[tex]\\ \sf\longmapsto 13-8[/tex]

[tex]\\ \sf\longmapsto 10[/tex]

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Step-by-step explanation:

[tex]n(aub) = n(a) + n(b) - n(anb) \\ = 8 + 5 - 3 \\ = 8 + 2 \\ = 10 \\ thank \: you[/tex]

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