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Exercise 8.2 - Answers
1 |
(i) |
This is an equivalence relation. The equivalence classes are the six crews and each has nine members. |
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(ii)
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This is not an equivalence relation. It is neither reflexive nor transitive. |
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(iii)
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This is an
equivalence relation. There are nine equivalence classes, corresponding
to the nine positions in an eight, and each class has six members. |
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(iv)
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This is an equivalence relation. There is just one equivalence class, with 54 members. |
