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the "by"of you" usage suggests itwould be used when what is being spoken about consists of one item "by you" would be used as if it were in the past tense. whereasresponse to more than one or numerous topics

So if there is only one question being asked, then the "of you" use would be used inappropriate.

IF there is more than one question incorporated into the tensescenario, then you would use "by you"

Example sentences: What a silly question of an immediate responseyou. What interesting questions by you.

the "by you" usage suggests it being used as if it were in the past tense. whereas the "of you" would be used in the tense of an immediate response.

"of you" would be used when what is being spoken about consists of one item "by you" would be used in response to more than one or numerous topics

So if there is only one question being asked, then the "of you" use would be appropriate.

IF there is more than one question incorporated into the scenario, then you would use "by you"

Example sentences: What a silly question of you. What interesting questions by you.

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the "by you" usage suggests it being used as if it were in the past tense. whereas the "of you" would be used in the tense of an immediate response.