Difficulty of brute-forcing a seed with missing words?

Difficulty of brute-forcing a seed with missing words?

Given a 12 or 24 word seed with one one or more missing words what would be the difficulty of brute-forcing the missing words? E.g. for:

  • one missing word
  • two missing words
  • three missing words

By difficulty I mean the number of combinations that would have to be checked against a dictionary.

And the related question: how many words would have to be missing in order to make the attack reliably unfeasible?

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