Let \mathbb{Z} be the set of all integers and let * be a binary operation in \mathbb{Z} defined by a^* b=a+b+10 for all a, b \in \mathbb{Z} The identity element of this group is

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Let ℤ be the set of all integers and let * be a binary operation in ℤ defined by a*b=a+b+10 for all a,b∈ℤ The identity element of this group is

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