Assam Governor Padmanabha Balakrishna Acharya administered the oath of office and secrecy to Choudhury in the presence of Chief Minister Sarbananda Sonowal at a function held in the Durbar Hall in Raj Bhawan.
Phani Bhusan Choudhury is an AGP MLA.
Parliamentary Affairs Minister Chandra Mohan Patowary, Chief Secretary V K Pipersenia and other dignitaries were present at the function.
The governor has summoned the Assam Assembly to meet at 9 AM on June one.