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When to use Combination with repetition and when to use Variation with repetition in choosing drinks and dessert example given in “Combinatorics: Practical Example”

When to use Combination with repetition and when to use Variation with repetition in choosing drinks and dessert example given in “Combinatorics: Practical Example”

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“Combinatorics: Practical Example” in this video I am not able to understand when to use variationwith repetation and when to use combination with repetation?

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365 Team
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Hey Chintan, 
 
In this video, like often times in real life, we’re setting the assumptions ourselves. 
 
In one case, we’re saying we’ll be getting different drinks because we can share. In the other scenario, we’re assuming order matters because of the “Share a Coke with…” campaign where we get different names on the bottle labels. 
 
As for the desserts, we’re just assuming that since they’re all the same, it doesn’t matter if we order one chocolate pizza and one ice-cream, or one ice-cream and one chocolate pizza. It’s essentially the same order for Domino’s and it’s up to us to decide how to split the food. 
 
Hope this helps!
Best,
365 Vik