Whats the chance of getting an Enchanted Book with 7 enchants on it with 1 NBT tag and in Survival? I know that when Enchanting an item there's a chance that another enchant will will go onto the item and it gets lower each time. I don't do a lot of enchanting but I've never seen any book with more than 5 enchants on it until today. Someone managed to get one on the Server I play on. Here's a screenshot if your interested. https://prnt.sc/l92l32
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This would be pretty rare and could only be gotten through finding a chest in a stronghold or jungle temple or by catching it while fishing. Normal enchantment of a book has a mechanic where if multiple enchants are going to be applied one of them is chosen at random and removed but that isn't the case with game-generated minecraft enchanted books and being generated they also have the ability to use 'treasure' enchants which means they usually have more enchants then what you can get at a table. https://minecraft.gamepedia.com/Enchanted_Book
From my experience today, it is, I finished making a raid farm and 5th round in, I checked the loot and got a 7 enchantment book, which has Fire Prot VI, Frost walker II, Respiration III, Feather Falling IV, Unbreaking III, Bane Of Arthropods IV and Channeling I, I have no idea how rare it is cause I don't think anyone else has gotten this