Question 346641
A couple of things.
1.Do I have to order every option to be considered a Petro?
Example: Everything but black olives, is it a still a Petro?
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2. Cheese was not provided on the original ingredient list. 
Should it have been?
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Here's the formula,
{{{N=A*B*C*D*E*F*G}}}
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A:Chili choices,2
B: Pasta or corn chips,2
C:Tomatoes, 1
D:Onions, 1
E:Sour Cream or Fat Free Sour Cream ,2
F:Jalapenos,1
G:Olives,1
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If no olives is allowed, every choice gets bumped up by 1.
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If you had to choose each option and Cheese isn't an option, then
{{{N=2*2*1*1*2*1*1=8}}} possible Petro combinations.
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If you can choose no olives or any other ingredient and Cheese is added.
{{{N=3*3*2*2*3*2*2*2=3^3*2^5=2592}}} possible Petro combinations.