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Class 12MathematicsRelations and FunctionsBinary operationsEasy
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If (a\ast b=a+b-5), what is the identity element of this operation?

Answer and explanation

Correct answer: (5)

Step 1: Write (a\ast e=a). Step 2: From (a+e-5=a), we get (e=5). Also, (e+a-5=a) gives the same. Step 3: In an operation like (a+b-c), the number (c) often becomes the identity.

Related tags

Identity ElementCustom OperationEasyBinary 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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