Question

How many different flags with 3 stripes

are possible, using the colours rby
red (r), blue (b) and
yellow (y)? each colour can
be used only once in each flag.

Answer 1

`n` elements can be arranged in
`n!` ways.

Therefore, there are as many flags as there are ways to arrange 3 stripes of different color, which is
`3!=6`.