63-year-old Kumar was administered the oath of office by Governor Keshari Nath Tripathi at a glittering function at the Raj Bhawan, which was attended, among others by Manjhi, who had refused to quit as chief minister to make way for Kumar in defiance of the party leadership.
Besides Kumar, 22 ministers, including three women, were also administered the oath of office.
Former prime minister H D Deve Gowda, several chief ministers - Mamata Banerjee (West Bengal), Akhilesh Yadav (Uttar Pradesh), Tarun Gogoi (Assam) and INLD leader Abhay Chautala, were also present on the occasion.
Of these 22 ministers in Kumar's team, 20 had resigned from the Manjhi government, while two others, namely P K Shahi and Rajiv Ranjan Singh alias Lallan Singh, were sacked by the former chief minister.
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With today's swearing in, 63-year-old Kumar is back in the Chief Minister's chair he had quit on May 17, 2014 over JD(U)'s debacle in the general election.
But, within eight months of the decision Kumar was forced to change the plot in the wake of dissent against him by Manjhi along with a section of JD(U) ministers and legislators.
BJP used the dissension to the hilt and extended support to Manjhi. But, the floor test could not be taken as Manjhi tendered his resignation ahead of the vote on Friday last.