What should be answer to interview question - 'In how many interviews have you sat before this?

now you must have surely gained convincing abilities. You could easily say a number equal to your No. Of Organizations worked +2 just not to over throw that you got selected in all interviews that you attended.

The answer to this has multiple scenarios. I'll write what I currently have in mind and update it from time to time.

#1 When you don't hold any jobs currently.

You could be honest with your answer. But you must highlight that either the salary offer didn't meet your expectations or you were over qualified for the role, provided you really have convincing communication. If communication is your problem it's difficult to convince. Better to be brutally honest. The interviewer also is aware that it's not always your fault for not making it a success.

#2 When you have enough work positions and experience

By now you must have surely gained convincing abilities. You could easily say a number equal to your No. Of Organizations worked +2 just not to over throw that you got selected in all interviews that you attended. That's gonna be a cold lie, unless you attended only one interview and got selected and you've worked only there ever since. Mine is positions+1. :):)

Don't feel I'm misleading with my answers. You could feel free to discard my suggestion. But remember, interview is a process where two parties involved are lying to each other.