Question

Either he or i ..... mistaken (am/is)

Answer 1

Am is the answer to this question
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Answer 2

Either he or i ..am... mistaken.

1. the above word am is a verb .
2. a verb refers to the action and are hence called doing word.
3. either is treated as singular and therefore we use a singular verb with it although there are two pronouns. also the presence of the conjunction "or" is suggestive of singular verb.
4. the verb "is" is never used with the pronoun "I'
5. so the correct option is "am".