Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
discrete math help please!?
how many 2-element subsets does {a} have?
how many 2-element subsets does {a,b} have?
how many 2-element subsets does {a,b,c} have?
i dont understand how i would answer this question.
Hey Meng Tian! i thought the ALL sets automatically contains empty set no matter wat, or i could be wrong. but if so, wouldnt it be {empty set, a}?
1 Answer
- ?Lv 710 years ago
1) 0 subset. The set does not even contain 2 elements in the first place.
2) 1 subset. And that will be {a, b} itself. Note that each set is a subset of itself.
3) 3 subsets. {a, b}, {b, c} as well as {a, c}.