2006 AMC 10A Problems/Problem 18
Contents
Problem
A license plate in a certain state consists of digits, not necessarily distinct, and letters, also not necessarily distinct. These six characters may appear in any order, except that the two letters must appear next to each other. How many distinct license plates are possible?
Solution
There are ways to choose 4 digits.
There are ways to choose the 2 letters.
For the letters to be next to each other, they can be the 1st and 2nd, 2nd and 3rd, 3rd and 4th, 4th and 5th, or the 5th and 6th characters. So, there are choices for the position of the letters.
Therefore, the number of distinct license plates is .
Solution 2 (Answer choices)
There are ways to choose the digits and ways to choose the 2 letters. However, since the letters are next to each other, the result must be . The only answer choice that matches this is .
~ Andrew2019
Video Solution by OmegaLearn
https://youtu.be/0W3VmFp55cM?t=847
Video Solutions
https://youtu.be/3MiGotKnC_U?t=1446
~ThePuzzlr
~savannahsolver
See also
2006 AMC 10A (Problems • Answer Key • Resources) | ||
Preceded by Problem 17 |
Followed by Problem 19 | |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | ||
All AMC 10 Problems and Solutions |
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