Question

True or false? The digits 6, 7, 8, and 9 are to be used in a 2-digit identification code. If repetitions are not permitted, there are 12 possible codes.

Answer 1

yes your answer is true

Answer 2

Answer:

You can have: 6-7, 6-8, 6-9, 7-8, 7-9, 8-9 = 6

If you reverse the the above combinations, 7-6, 8-6, etc

then you can have 12 codes.