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COMEDK2019MathematicsSets and Relations

- On the set Z , of all integers * is defined by a * b=a+b-5 . If 2 *(x 3)=5 , then x=

Options

  1. A0
  2. B3
  3. C5
  4. D10

Correct answer

D. 10

Step-by-step solution

We have, a*3=a+b-5 Now, x 3=x+3-5=x-2 Again, 2 *(x * 3)=5 2(x-2)=5 2+x-2-5=5 x=10

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