(a) Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with them both) said that the Messenger of Allah (peace and blessings be upon him) said: "The takbir in (Eid al-)Fitr is seven in the first rak'ah and five in the second, and the recitation comes after them in both."
(b) Ibn al-Mubarak, Waki', Abu Asim, Uthman bin Umar and Abu Nu'aym narrated it likewise from Abdullah (al-Ta'ifi), and all of this indicates the error of Sulayman bin Hayyan's narration from Abdullah al-Ta'ifi in this hadith: seven in the first and four in the second.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة العيدين / 6172