Answer:
Yes, the word "his" in the sentence "The mistake was his" is a possessive pronoun.
Explanation:
Here's why: Possessive pronouns replace nouns to indicate who something belongs to. Examples of possessive pronouns include:
1. His
2. Hers
3. Theirs
4. Yours
5. Its
As you can see, the "his" is included into Possessive pronoun and that makes the sentence a Possessive pronoun.
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