
1. A pair of elements a,b put in a particular order say (a,b) is called an ordered pair.
2. Cartesian product of sets: 3. In A ´ B the first coordinate belongs to set A, while the second coordinate belongs to set B. 4. A ´ B ¹ B ´ A. 5. If n(A) = a and n(B) = b then n(A ´ B) = ab, where n(A) is number of elements in A and read as the cardinal number of set A. 6. If A = {} and, B = {} then A ´ B = {}. 7. If one of the sets A and B is empty then A ´ B = {}.
8. The Cartesian product of two sets is represented by Directions: Choose the correct answer. 