January 2006
Beginner
182 pages
5h 15m
English
Content preview from Perfect Passwords: Selection, Protection, Authentication
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Figure 4.2 In a Lottery If You Get a Win by Matching Any Three
Numbers in Any Order, There Are 220 Possible Combinations. If Order
Does Matter, Then There Are 1,000 Possible Permutations.
The difference between 220 and 1,000 is great, but to help you better
understand the difference, let’s look at how the numbers grow depending on
how many numbers you can choose from, as Table 4.1 shows. If you increase
the pool of numbers you can select from, the number of permutations
increases dramatically.
Table 4.1 Increasing the Pool of Numbers Greatly Increases the
Permutations
Selections Combinations Permutations
3 220 1,000
6 5,005 1,000,000
7 11,440 10,000,000 ...
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