Risky Puzzle_Could you solve this?

Risky puzzle-1
Its very hard puzzle . Only genius can solve this. If you got a correct answer for this puzzle ? you are very great !
* Comment your answer with reasonable explanations..Thank you.


  1. I suggest 7 can be the answer, because considering the circles as the sets consisting elements, 7 is appearing as the common element. With this, 7 is the answer


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