# GATE Mechanical 2016 Set 2 | GA Question: 9

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The binary operation $\square$ is defined as $a \square b = ab+(a+b)$, 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 $a \square x = a$, for any $a$, is

1. $0$
2. $1$
3. $2$
4. $10$.

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