Well, eric. Here's the differences. 2 is the formal way of asking question, with the existence of the 'Adakah' which is the questioning word. 3 is a little bit informal, sometimes we do use this with the word 'kah' as the short form of 'adakah'. But we pronounce it as 'ke' instead of 'kah'. and yes, 1 is the most commonly used in our daily conversation, without any questioning words. But if you're about to use this, you have to use the right tone for asking. or else, it's gonna be a statement rather than a question. Hope this help, eric.