Do you like to crack riddle? Try this

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The riddle goes like this, This is this particular executive club that require member to say out a password before they can let them in. One day, you are standing outside observing their password so that you can enter the club and this is what you hear, Guard asked: "Twelve" Member A answered: "Six" Member A is being let in. Next member B arrived and guard asked: "six" Member B answer: "Three" Member B is also allowed inside. Then you try to go in and the guard asked: "Ten" What should you answer in order to go in?