As you'll see below, in your sentence either the possesive pronoun his or the indefinite article an may be used. I think if you use the word his , you implicate, through a very subtle suggestion, that his education was different than just any education. org/wiki/Possessive_adjective Semantics For possessive adjectives as elsewhere, the genitive does not always indicate strict possession , but rather a general sense of belonging or close identification with .
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