 Intro to Combinations and Permutations
 Permutations with Repetition
 Permutations without Repetition
 Permutations Formula

License Plates  Android Lock Screen
 Tigers and Bears  Oh My

Combination without Repetition  Combination Formula
 Combining Combinations

The String of Beads  Anagrams
 Combinations with Repetition I
 Combinations with Repetition II
License Plates
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Now that you know the basics of permutations, you should be able to solve the next few permutation practice problems.
License plates consist of 7 characters according to the following pattern:
 1 nonzero digit, followed by:
 3 letters from AZ, followed by:
 3 digits from 09.
You would like to know how many possible unique license plates can be created.
Challenge
How many possible license plates can be created?
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Comments
rodrigo perez
Sep 28, 6:00 PMAZ 26 letters.
Vivek
Nov 29, 2:42 AMI was stupid to think that there were 27 alphabets .
Bryan
Jan 12, 5:43 AMConfused (again =p)! We were learning about permutations and the answer seems to be exponents?
Based on the previous nodes I would have assumed 9 * (26!/23!) * (10!/7!) would be the way to work this one out? Did I get lost somewhere along the way?
Learneroo
Jan 12, 8:02 AMThese are practice challenges for what was covered until now, not just the last page. "Permute" is only used when one less element becomes available each time, but here you can reuse the same characters. See Permutations with Repetition for more.