Peter sells 5 flavors of gelato at his stand. today he is selling hazelnut, chocolate, tiramisu, pistachio, and strawberry. allen wants to try three different scoops in his cone. below is a list of possible combinations. what's missing?

C-T-S  

H-T-P

Step-by-step explanation:

Here, you want to combine 5 differents flavors selecting 3 of them. C(5, 3) = 10, so, there are 10 different arrangements, 8 of them were already selected, C-T-S and  H-T-P are missing . Notice that S-T-H is not correct because H-T-S is already chosen and P-T-S is not correct because T-P-S is already chosen.

over the argument its not good to fight.

sorry, i can't understand your question. will later if you describe more clearly!

: )