Answer :
We need to use the combination formula, which is given by:
[tex]\text{nCr}=\frac{n!}{(n-r)!r!}[/tex]Where n is the total of bitmap and r is the combinations.
Replacing:
[tex]9C6=\frac{9!}{(9-6)!6!}[/tex][tex]9C6=\frac{9x8x7x6!}{3!6!}[/tex][tex]9C6=\frac{9x8x7}{3!}[/tex][tex]9C6=84[/tex]There are 84 website graphics that can be created using at least six of nine different bitmap images.