The a distractor entails not considering that the data obtained from counting responds to 2 variables – having or not having a type of pet; it specifically considers 8 dogs but does not subclassify into yes/no cat; thus, 2 + 6 = 8.
El distractor a obedece a no considerar que el dato obtenido del conteo responde a dos variables –tener o no un tipo de mascota-, específicamente cuenta ocho no perros pero no subcategoriza en si/no gato, así 2+6=8.