考前必读：2019年GRE考试数学考点3

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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.

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