Sabnam has 2 school bags, 3 tiffin boxes and 2 water bottles. Choosing one of each, she can carry them in:

1. Bags and boxes give 2 times 3, or 6 pairs. 2. Each pair takes 2 bottle choices. 3. That gives 12 ways. _Source: syllabus Mathematics, Chapter 7, Permutations and Combinations._