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Explanation: The correct translation in my view would be "Hallo, wie geht's?" since the above English sentence is a rather informal greeting. But as you stated formal I think the proper translation would be the above
IngePreiss Germany Local time: 11:49 Native speaker of: German
Explanation: Hello is in common use in URDU also it can be used to let some know that you are calling him or her so its sunoo or suniyay, then for How are you is aap kaisay hain ya ap kaisi hain if its for a female.
Shahid Khan United Kingdom Local time: 10:49 Native speaker of: English, Urdu PRO pts in pair: 26