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Relations & Functions · Question 50 of 125

Into how many equivalence classes does this remainder relation split A?

Question 50

EasyOriginal question

On A={1,2,3,4,5,6}A = \{1, 2, 3, 4, 5, 6\}, the relation RR is aRba \mathrel{R} b if a−ba - b is divisible by 3.

Into how many equivalence classes does this remainder relation split AA?

Options for question 50

Show the answer and explanation
CorrectNot quiteAnswer B

Correct answer: B

Explanation

  1. The classes are {1,4}\{1, 4\}, {2,5}\{2, 5\} and {3,6}\{3, 6\}.

  2. 3 classes, one per remainder.

Worth noting

6 counts the elements, not the classes.

Concept
The number of classes
Typical time
90 s
Your time
—
The rule this testsEquivalence relations and classes
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Ten questions from Relations & Functions, at your own pace.

Practise this chapter →

Ten questions from Relations & Functions, at your own pace.