lower, if the 30th of Nissan is on Shabbos than 29th of Nissan will be Friday so aleph Niissan will be also on Friday and so will Pesach and אדו לא ראש and בדו לא פסח. This itself negates it as the first day of Pesach cannor fall on Friday. According to your calculation גר the third day of Pesach is the first day of Rosh Hashanah which would be Sunday.
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