Difference between revisions of "2014 UNM-PNM Statewide High School Mathematics Contest II Problems/Problem 5"
(Created page with "== Problem == <math>5^n</math> is written on the blackboard. The sum of its digits is calculated. Then the sum of the digits of the result is calculated and so on until we have ...") |
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Revision as of 23:44, 7 November 2014
Problem
is written on the blackboard. The sum of its digits is calculated. Then the sum of the
digits of the result is calculated and so on until we have a single digit. If 
, what
is this digit?
Solution
See also
| 2014 UNM-PNM Contest II (Problems • Answer Key • Resources) | ||
| Preceded by Problem 4 |
Followed by Problem 6 | |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 | ||
| All UNM-PNM Problems and Solutions | ||
