Informal invitations are like ordinary letters, though using more formal language. They are addressed to the recipient by name, and the formal close is generally any of the following:
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Sincerely yours or
Yours sincerely or
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Yours affectionately etc.
Sample
My dear Shri Verma
Will you please give me the please of your company at dinner on Monday, the…..July, Year, at Time, at my residence.
Date……
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Yours sincerely
Signature
Name
Address
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Phone