6 different ways
Explanation:The girl has a total of 6 colours of thread remaining
Out of the remaining 6 colours left, she needs only 5 threads to complete the tapestry.
This means that she will select 5 out of the available 6 colours of threads to complete the tapestry
This can be done using combination 6C5
Note that:
[tex]nCr=\frac{n!}{(n-r)!r!}[/tex]Using the formula above for 6C5
[tex]\begin{gathered} 6C5\text{ = }\frac{6!}{(6-5)!5!} \\ \\ 6C5=\frac{6!}{5!} \\ \\ 6C5=6 \\ \end{gathered}[/tex]She can finish the tapestry in 6 different ways