Concept explainers
Shown in the figure is a 5-hour clock and the table for clock addition in the 5-hour system.
|
0 | 1 | 2 | 3 | 4 |
0 | 0 | 1 | 2 | 3 | 4 |
1 | 1 | 2 | -*>3 | 4 | () |
2 | 2 | 3 | 4 | 0 | 1 |
3 | 3 | 4 | _______0 | 1 | 2 |
4 | 4 | 0 | 1 | 2 | 3 |
a. How can you tell that the set {0,1,2,3.4} is closed under the operation of clock addition?
b. Verify the associative property:
c. What is the identity element in the 5-hour clock system?
d. Find the inverse of each element in the 5-hour clock system.
e. Verify two cases of the commutative property:
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