SOLUTION: How many website graphics can be created by using at least seven of nine different bitmap images?

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Question 1169590: How many website graphics can be created by using at least seven of nine different bitmap images?
Found 2 solutions by MathLover1, ikleyn:
Answer by MathLover1(20855) About Me  (Show Source):
You can put this solution on YOUR website!

use combination formula:
nCr=n%21%2F%28%28n-r%29%21r%21%29 where n=9 and r=7

9C7=9%21%2F%28%289-7%29%217%21%29

9C7=9%21%2F%282%217%21%29

...simplify



9C7=9%2A4

9C7=+36
36 website graphics can be created by using at least seven of nine different bitmap images

Answer by ikleyn(53763) About Me  (Show Source):
You can put this solution on YOUR website!
.

At least seven means 7, 8 and 9.


So, "How many website graphics can be created" = C%5B9%5D%5E7 + C%5B9%5D%5E8 + C%5B9%5D%5E9 = %289%2A8%29%2F2+%2B+9+%2B+1 = 36 + 9 + 1 = 46.    ANSWER

Solved.

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