GIVE ANSWERS - Deutsch

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i have a question when you want to send a letter to a parents of a friend called ´´ herr und Frau Sanders ´´ we write in the salutation ( Anrede) in the letter like this ´´ Sehr geehrte herr und Frau Sanders ´´ , is it correct?  and other question in case i want to send it to my professor . what to write in the salutation in the letter? please answer me i need to know:

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__Viktoria__ profile picture __Viktoria__February 2023
”Sehr geehrte Frau Sanders, sehr geehrter Herr Sanders” if you want to be formal, but it heavily depends on how formal you want to be, how well you know them and who you know best. ”Mit vielen Grüßen”, ”Mit freundlichen Grüßen”, ”Viele Grüße” all are fine for salutations to a prof