Which of the following statements is not correct with regard to a mathematics textbook ?

The correct answer is A mathematics textbook should have solved examples only.

Explanation:

A good mathematics textbook should provide a balanced approach to learning. It needs both solved examples (to demonstrate concepts, strategies, and step-by-step problem-solving methods) and unsolved exercises (to encourage practice, critical thinking, and independent problem-solving among students).

If a textbook were to contain only solved examples, students would lose the opportunity to independently apply the concepts they have learned and build problem-solving resilience. Therefore, the statement claiming a mathematics textbook should have solved examples only is incorrect.

Analysis of other options:
1. "Examples in a mathematics textbook should be related to daily life of the students." – This is correct, as real-world context makes learning relatable and meaningful.
2. "A textbook of mathematics should not be very thick or heavy." – This is correct, as excessively heavy textbooks can be physically burdensome and intimidating to students.
3. "A mathematics textbook should have varied exercises to give practice to students." – This is correct, as variety in exercises caters to different cognitive levels and reinforces learning effectively.