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Class 12MathematicsRelations and FunctionsBinary operationsMedium
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If (a*b=a+b) is taken on the set of multiples of (3), what type of operation is it?

Answer and explanation

Correct answer: Closed operation

Step 1: Two multiples of (3) can be written as (3m) and (3n). Step 2: Their sum is (3m+3n=3(m+n)), again a multiple of (3). Step 3: For multiples, use general form reasoning.

Related tags

ClosureMultiplesBinary OperationsRelations And FunctionsMathematicsClass 12 Mcq
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10 more MCQs
  1. 1What is the correct meaning of a binary operation on a set (A)?
  2. 2If (a,b\in A) implies (a*b\in A), which property does this show?
  3. 3Why is usual addition (+) a binary operation on the set of natural numbers (\mathbb{N})?
  4. 4Why is usual subtraction (-) not a binary operation on the set of natural numbers (\mathbb{N})?
  5. 5How is usual multiplication (\times) on the set of integers (\mathbb{Z})?
  6. 6Why is usual division (\div) not a binary operation on the set of integers (\mathbb{Z})?
  7. 7If (a*b=a+b) is defined on real numbers, what type of operation is it?
  8. 8If (a*b=a-b) is defined on real numbers, which statement is correct?
  9. 9On real numbers, (a*b=a+b+1). What is the identity element of this operation?
  10. 10On real numbers, (a*b=a+b+ab). Which is the identity element of this operation?
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