COMEDK2013MathematicsMathematical Reasoning
If Q₁ is the set of all relations other than 1 with the binary operation * defined by a * b=a+b-a b for all a, b in Q₁ , then the identity in Q₁ with respect to * is
Options
- A1
- B0
- C-1
- D2
Correct answer
B. 0
Step-by-step solution
Let e be the identity element, then a * e =a a+e-a e=a e(1-a)=0 e=0 [a 1]