Quote from: Upgrade00 on August 17, 2020, 05:48:17 PM

The odds of this are impossible I would assume, cause afaik, only 12, 18 and 24 word seed phrases can be generated basically, and you should have a 23 word phrase with one missing.

BIP39 seed phrases can be 12, 15, 18, 21, or 24 words long. Each 3 words encodes for 32 bits of entropy.

Quote from: Upgrade00 on August 17, 2020, 05:48:17 PM

As suggested above you should drop that address as the phrase is faulty.

The phrase is not faulty, provided the checksum is correct. There is nothing inherently faulty about a phrase with a duplicated or even triplicated word. If Coinomi will not allow the phrase to be verified, it's because of a bug with Coinomi, not the phrase.

Quote from: hugeblack on August 17, 2020, 06:09:27 PM

1-((2048!)/(2048^18*(2048-18)!))

Correct, except replace the two "18"s with "24"s since we are dealing with a 24 word phrase. It is essentially a modified birthday paradox.