this is for holding javascript data
Rikki edited untitled.html
over 8 years ago
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three vegetarian entrees. How many dinners are there to choose from?
The rule of sum is applied
here because each entrée contains either meat or fish or is vegetarian. So we
have \(15+5+3=23.\)
The rule of sum is often expressed in terms
of sets:
The union between two sets is denoted as \(A\cup B\). The union means that a set of objects can happen in \(A\) or \(B\) ways or possibly even in both ways.
The intersection of sets is denoted \(A\cap B\). This is the set of
objects that can happen in \(A\) and \(B\) ways.
If the sets \(A\) and \(B\) have no like similar elements, then \(A\cap B=\left\{\right\}\) , which is known as the empty set.
The size of a set is
denoted data-equation="\left|A\right|">\(\left|A\right|\)or data-equation="\left|A\right|">\(\left|A\right|\) or \(\left|B\right|\) to show the amount of elements in set \(A\) or set \(B\).
