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Explanation: Patricia's answer is correct, but it is more usual to use the complete sentence:
Saludo a Ud. muy atentamente
Saludo a Uds. muy atentamente
Saludamos a Ud. muy atentamente
Saludamos a Uds. muy atentamente
Saludo, if it is a personal letter
Saludamos, if you are writing in the name of a company.
Ud. if it refers to one person
Uds. if it refers to a company.
Robert INGLEDEW Argentina Local time: 16:08 Native speaker of: English, Spanish PRO pts in pair: 2664