B - Coin Trade

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Utkarsh has a deep interest in coins, especially gold and silver coins. As a collector, he currently has $a$ gold coins and $b$ silver coins. Utkarsh defines a transaction as follows: - He sells one gold and one silver coin. - He receives one gold and one silver coin. - He sells one gold and receives one silver coin. - He sells one silver and receives one gold coin. He aspires to make seri

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