jesseabney
If A = {negative even integers} and B = {negative odd integers}, what is A U B?
Answer
{negative integers}
{ }
{integers}
{0}
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jagatuba
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That would be the union of set A and set B wouldn't it?
jesseabney
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yes
jesseabney
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thats the question
jagatuba
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Right but union in math really just means the same thing as it does in English 'to join'.
jagatuba
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What do you get when you join A and B?
jesseabney
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integers
jagatuba
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what kind of integers?
jesseabney
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positive
jagatuba
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Why positive?
jesseabney
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- and - = +
jagatuba
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This true if you are multiplying. IS that what is being done?
jesseabney
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i quit lol
jagatuba
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No don't quit
jagatuba
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YOu almost got it
jagatuba
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Think of it like this A U B is like saying A joined with B. If A was a set of red marbles and B was a set of blue marbles what would the set of A U B consist of?
jesseabney
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blue and red
jagatuba
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Correct. Joining them does not change their form to purple or something. We still have red and blue marbles. So apply that to a small set of numbers A={1,3,5} and B={2,4,6}. Now what is A U B?
jesseabney
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123456
jagatuba
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Right now expand that to a larger set A={all even numbers} and B={all odd numbers}. Now what is A U B?
jesseabney
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123456789 ...ect.
jagatuba
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Right or {all numbers}. Now just apply the appropriate terminaology (i.e. that used in your question), and you have your answer.
jagatuba
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If A={negative even integers} and B={negative odd integers} what does A U B contain?