According to Jean Piaget's theory of cognitive development, in which stage do the abilities of 'abstract thinking' and 'deductive reasoning' develop?

→ Under Jean Piaget's theory of cognitive development, when analyzing the capabilities of 'Hypothetico-Deductive Reasoning' and 'Combinatorial Thought' that develop in adolescents entering the 'Formal Operational Stage', which of the following statements most accurately defines the ontological and cognitive characteristics of this stage? → Which of the following psychological statements is most authentic and scientifically valid regarding the real psychological implications of 'Decentration'—a central concept under Jean Piaget's Theory of Cognitive Development defined as the advanced cognitive ability where a child can simultaneously consider, understand, and coordinate multiple aspects or dimensions of an object or situation rather than focusing on only one aspect, dimension, or feature (Centration)—and its scientific operation for students' multi-dimensional perspective, logical conservation, and cognitive flexibility in classroom teaching? → According to Piaget, in which stage of cognitive development does a child understand the concept of 'conservation'? → According to Jean Piaget's theory of cognitive development, what is the age range of the 'formal operational stage'? → Which of the following psychological statements is most authentic and scientifically valid regarding Robert Gagne's 'Hierarchy of Learning' concept of 'Problem Solving Learning', which represents the highest level of complex intellectual learning? → Which of the following psychological statements is most authentic and scientifically valid regarding Jean Piaget's concept of 'Conservation' in his Theory of Cognitive Development? → According to Jean Piaget's theory of cognitive development, the 'formal operational stage' (abstract thinking) is related to which of the following age groups? → According to Jean Piaget's theory of cognitive development, 'abstract thinking' is a characteristic of which stage?