Originally Posted by

**Raabi** I appreciate your attention and trying to help me. May be I could not explain my point. Let me try it again.

How many unique pairs of numbers can be made out of the 2 sets of numbers (1 to 6). Here, I did NOT use the word SET in technical sense; but just in general.

(1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6),

(2, 1), (2, 2), (2, 3), (2, 4), (2, 5), (2, 6),

(3, 1), (3, 2), (3, 3), (3, 4), (3, 5), (3, 6),

(4, 1), (4, 2), (4, 3), (4, 4), (4, 5), (4, 6),

(5, 1), (5, 2), (5, 3), (5, 4), (5, 5), (5, 6),

(6, 1), (6, 2), (6, 3), (6, 4), (6, 5), (6, 6)

You can count them **6*6 = 36 pairs**, in total (including repetitions). My confusion is why is it different from the result from the **Combination** formula (Not Permutation).

Secondly, I want to expand the number of sets to 10. Then, what will be the result