Some Confusion over partitive genitive

Latin Learning Latin
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Salvete Omnes!

Happy New Year (don’t know how to say it in Latin yet!)

Well, I’ve been reading Benn’s Easy Latin Stories.

Some of the passages have thrown me for a loop.

For example:

“Tum Pythius quidam, prodigium veritus, oravit Xerxem ut unum e quinque filiis, qui in exercitu essent, sibi relinqueret.”

Now, I understand what the sentence means and everything, but the “unum e quinque filiis.”

I was thinking partitive genitve, but it’s in the ablative, so is it ablative of separation?

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Happy New Year (don’t know how to say it in Latin yet!)

Felicem Annum Inientem! vel Felicem Annum Novum!

“unum e quinque filiis” = “one from the five sons” or “one out of the five sons”
Ablative of source, I think, if you need the label. // Ablativus originis, nisi fallor, cum titulum requiras.

Yes, see A&G §346.c (cum numero cardinali)

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Salve Adriane!

Gratias tibi ago!

Thanks for the reference in A & G.

Well, back to work!

Vale.

QuD