Which of the following statements are true or false? Give reasons for your answer. 

i) Pre-operational thinking is the characteristic of a two year old child.

ii) Each mathematical problem have a unique solution.

iii) ‘Today is a bright day’ is an unambiguous statement.

iv) The sum of the interior angles of a Pentagon is 450o

. v) If the capacity of a 3D-objects increases, then the volume also increases

i) Pre-operational thinking is the characteristic of a two-year-old child.
   - True. According to Jean Piaget's theory of cognitive development, pre-operational thinking is a stage that typically occurs between the ages of 2 and 7 years. During this stage, children develop symbolic thinking but still lack the ability for logical reasoning. They may struggle with conservation (understanding that the quantity remains the same despite changes in appearance) and have egocentric tendencies.

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