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C because a combination has multiple ways
A combination is a way of selecting several things out of a larger group, where order does not matter.
Thank you @misssunshinexxoxo :)
That I knew, but I thought C and D were similar.
It's a LARGE group
Ah large. 3 is not large haha. thanks
D is smaller having 3 people verses the picture frames
actually, I think B would be the better answer usually, when you arrange something in a row (like picture frames or people on a couch), the order matters
B really wouldn't be good because picture frames and paintings have multiple combinations
About B, I wasn't sure if it was that one or not because it says 'different' sets.
for example, if we have three people, Ally Betty and Cathy sitting on a couch, then if Ally Betty and Cathy sit in the order ABC, it's different than the order BCA or ACB
A combination is a way of selecting several things out of a "larger group", where order does not matter.
remember: permutation: order matters combination: order doesn't matter
B ONLY allows 4 SETS to be chosen out of 20
That fact I got down. I just forgot about the 'large' group part.
B is the better answer: if I pick 4 sets of towels, picking ABCD is the same as BCDA because it's the same 4 towels
*the same 4 sets of towels
C is the larger group
group size has nothing to do with combination vs permutation
well, maybe think about it this way: C and D are pretty much the same scenario with different numbers
Okay, that's what I thought as well.
alright, hopefully my explanation wasn't too confusing D:
Not too hard to follow, thanks :)
I just don't know now because D is just a larger version of C. And A says 'different' sets.