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Do you consider the following is correct and ha no ambiguity? Is this GMAT style? have you encountered any OG question like this?
Napoleon's plan was great but his tactics were obsolete.
Yup, this would be completely acceptable on the GMAT. "Napoleon's" is the only plausible referent for "his", so you're all good. And sure, you see possessive pronouns (usually "its" and "their") on the GMAT quite a bit, so it's definitely possible that you'll see this sort
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