GATE Mechanical Engineering (ME) 2016 Shift 2 Solved Paper

Question : 9 of 65

Marks: +1, -0

The binary operation □ is defined as a □ b = ab + (a + b), where a and b are any two real numbers. The value of the identity element of this operation, defined as the number x such that a □ x = a, for any a, is_______.