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Find the which of the operations given above has identity ?

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To determine which of the given operations has an identity element, we will analyze each operation step by step. ### Step 1: Analyze the first operation \( a \text{ binary } b = a - b \) 1. **Definition of Identity Element**: An identity element \( e \) for a binary operation \( \text{binary} \) must satisfy the condition: \[ a \text{ binary } e = a \quad \text{and} \quad e \text{ binary } a = a \] ...
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