All 5-digit zip codes in the United States are assigned by region. In Texas, all zip codes begin with the number 7 while the second digit is restricted to numbers from 5 to 9. There is no restriction on the remaining digits. How many zip code combinations are possible in Texas
Permutations and Combinations
If there are 5 dishes, they can be relished in any order at a time. In permutation, it should be in a particular order. In combination, the order does not matter. Take 3 letters a, b, and c. The possible ways of pairing any two letters are ab, bc, ac, ba, cb and ca. It is in a particular order. So, this can be called the permutation of a, b, and c. But if the order does not matter then ab is the same as ba. Similarly, bc is the same as cb and ac is the same as ca. Here the list has ab, bc, and ac alone. This can be called the combination of a, b, and c.
Counting Theory
The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.
All 5-digit zip codes in the United States
are assigned by region. In Texas, all zip
codes begin with the number 7 while the
second digit is restricted to numbers from
5 to 9. There is no restriction on the
remaining digits. How many zip code
combinations are possible in Texas?
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