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Combinations of Choices
If there are n choices for one type and m choices for second type, then
number of combinations for both types is the product of choices:n*m.
Example:
If there are 3 kinds of breads to choose from and 4 kinds of meats, then we
can make 3*4=12 different sandwiches.
If an alphabet has 26 letters, then the number of possible 2 letter word is
26*26=676.All of them may not be vaild words.
Remember:
Do not add the choices to get the total combinations.
The product rule can be applied to more than two types of choices: if there
are 3 kinds of breads, 4 kinds of meats, and 6 kinds of cheeses, then we can
make 3*4*6=72 different sandwiches.
GRE数学考点：Combinations of Choices
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