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Why can't one cook for the second day of Yom Tov on the first day? Why won't something along the lines of Eiruv Tavshilin help in this case as well?

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up vote 5 down vote accepted

The format of a 2-day Yom Tov is a s'feika d'yoma. If Thursday is the Yom Tov, I cannot cook for Friday which is Chol (Rosh Hashana isn't exactly because of the same reason, but the same answer would apply).

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I don't see how this answers the question, as you're allowed to cook for the same day. – SAH Dec 15 '15 at 20:34
@SAH That same day is either Yom Tov or not. Either way you can cook for it. – Double AA Apr 27 at 6:08

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