गणित में पैटर्न (प्रतिरूप) निम्नलिखित में से किसका प्रत्यक्ष प्रतिनिधित्व नहीं हो सकते हैं?

Which of the following are desirable characteristics of a good textbook? a. Content b. Presentation c. Editing d. Big in size

The Heuristic method of teaching was advocated by:

Which teaching method proceeds from concrete concepts to abstract concepts?