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☆ RESOLUCIÓN:
[tex]→ \boxed{ \frac{4 + 8}{2} = \frac{12}{2} = 6 }[/tex]
[tex]→ \boxed{ \frac{5 + 11}{2} = \frac{16}{2} =8 }[/tex]
[tex]→ \boxed{ \frac{9 + 13}{2} = \frac{22}{2} = 11}[/tex]
☆ RESPUESTA:
[tex] \boxed{D) \: 11}[/tex]