Difference between revisions of "2007 UNCO Math Contest II Problems/Problem 10"
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== Solution == | == Solution == | ||
− | + | (a) <math>4^6-2\cdot3^6+2^6</math> | |
+ | |||
+ | (b) <math>4^n-3\cdot 3^n+3\cdot 2^n-1^n</math> | ||
+ | |||
+ | (c) Generalize | ||
== See Also == | == See Also == |
Revision as of 02:05, 13 January 2019
Problem
A quaternary “number” is an arrangement of digits, each of which is
Some examples:
(a) How many -digit quaternary numbers are there in which each of
appear at least once?
(b) How many -digit quaternary numbers are there in which each of
appear at least
once? Test your answer with
(c) Generalize.
Solution
(a)
(b)
(c) Generalize
See Also
2007 UNCO Math Contest II (Problems • Answer Key • Resources) | ||
Preceded by Problem 9 |
Followed by Last question | |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 | ||
All UNCO Math Contest Problems and Solutions |