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The wallet will be recovered if the seed is valid. The seed is valid if the checksum match. The checksum matches for many seeds, it's not super unlikely to randomly select such a seed that is valid. It's just not very likely and that's usually good enough - i.e. when you type your seed and make one mistake, you quite likely get error. You can see how likely it is here - https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki - it depends on how long is your seed - 12 words is 128 bits of entropy and checksum there is 4 bits - meaning 1 in 16 is valid. 24 words is 256 bits of entropy and there checksum is 8 bits - meaning 1 in 256 is valid. So if your mnemonic was just 12 words then you get 1 in 16 chance that you randomly select correct seed and it will be accepted and recovery will succeed.
