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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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