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Class 12MathematicsRelations and FunctionsIntroduction to RelationsEasy
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If (A={1,2,3}), how many pairs are there in the universal relation on (A)?

Answer and explanation

Correct answer: (9)

Step 1: The universal relation is (A\times A). Step 2: Since (n(A)=3), (A\times A) has (3^2=9) pairs. Step 3: Count all possible ordered pairs for a universal relation.

Related tags

RelationsUniversal-RelationCountingIntroduction To RelationsRelations And FunctionsMathematicsClass 12 Mcq
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10 more MCQs
  1. 1If (A={1,2}), what does a relation on (A) mean?
  2. 2If (A={a,b}) and (B={1,2}), how many ordered pairs are there in (A\times B)?
  3. 3If (A={1,2}), how many total relations can be formed on (A)?
  4. 4Which relation is the universal relation on (A={1,2,3})?
  5. 5Which statement is correct about the empty relation?
  6. 6Which pairs are compulsory in the identity relation on a set (A)?
  7. 7If (A={1,2,3}), which is the identity relation?
  8. 8What condition is necessary for a relation (R) to be reflexive?
  9. 9On (A={1,2}), which property is definitely satisfied by (R={(1,1),(2,2),(1,2)})?
  10. 10Why is (R={(1,1),(2,2)}) not reflexive on (A={1,2,3})?
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