CD collection

How many different ways can I arrange the CDs in my collection?
Exploring and noticing Working systematically Conjecturing and generalising Visualising and representing Reasoning, convincing and proving
Being curious Being resourceful Being resilient Being collaborative

Problem



I have 3 Elvis Presley CDs, 2 Beatles CDs and 1 Queen CD.

How many different ways can they be lined up on a shelf if I must keep all the CDs by the same artist together?

This problem is adapted from the World Mathematics Championships