Respuesta:
13.
Explicación paso a paso:
(3+9)/2 = 6.
(15+ 5)/2 = 10.
(8+18)/2 = 13.
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Respuesta:
13.
Explicación paso a paso:
(3+9)/2 = 6.
(15+ 5)/2 = 10.
(8+18)/2 = 13.