2007 iTest Problems/Problem 25
Problem
Ted's favorite number is equal to
Find the remainder when Ted’s favorite number is divided by 25.
Solution
Let . That means We know that , so If , then , so Note that . Using the properties of modular arithmetic, we can find the remainder when is divided by . The remainder when Ted’s favorite number is divided by 25 is .
See Also
2007 iTest (Problems, Answer Key) | ||
Preceded by: Problem 24 |
Followed by: Problem 26 | |
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