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On real numbers, (a*b=a+b+ab) is defined. Which is the most suitable reason for this operation being associative?

Answer and explanation

Correct answer: Because (1+(a*b)=(1+a)(1+b))

Step 1: (1+(a*b)=1+a+b+ab=(1+a)(1+b)). Step 2: Multiplication is associative, so changing brackets in ((1+a)(1+b)(1+c)) does not change the value. Step 3: Recognizing a hidden structure saves lengthy calculation.

Related tags

Binary OperationsAssociativityStructureReal NumbersRelations And FunctionsMathematicsClass 12 Mcq

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