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edit: got everything wrong, double-counted, and agree with duncs below that it's choices (2) to the power of people (3), so 8.
https://www.mathsisfun.com/combinatorics/combinations-permutations-calculator.html
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hvsds
Cheers.
Yes, it's just 3 options each yes or no.
Ie what are all the combinations of those three either sending or not sending me a card.
I found something referencing the n and r, but didn't understand how to apply it. n = names of people sending me cards, right?
But then how does r fit in?
When I write them in a table I get 18 entries, but I'd like to verify that, and also have more knowledge for the future if I come across a bigger number of options.