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Elections for the post of first president of India were to be held on 24 January 1950. There was only one nominee for the post, Rajendra Prasad and he was elected, unopposed, as the President.
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The Constituent Assembly of India met for the last time on 24 January 1950, two days before the Constitution came into effect on the 26th. On that day, they declared that the song Jana Gana Mana was the national anthem of India, signed a Hindi copy of the constitution and voted in a new President. Prasad had been the president of the Constituent Assembly from December 1946. He was proposed to be the first Indian president by Jawaharlal Nehru and was seconded by Vallabhbhai Patel. There were no other nominations and hence the secretary of the assembly, H. V. R. Iengar declared that Rajendra Prasad was considered to be duly elected to the office of President of India.
"Constituent Assembly Debates On 24 January, 1950". 24 January 1950. Retrieved 10 January 2022. I have to inform honourable Members that only one nomination paper has been received for the office of the President of India. The name of that candidate is Dr. Rajendra Prasad. ... His nomination has been proposed by Pandit Jawaharlal Nehru ... and seconded by Sardar Vallabhbhai Patel ... I hereby declare Dr. Rajendra Prasad to be duly elected to the Office of President of India
Janak Raj Jai (2003). Presidents of India, 1950-2003. Daya Books. ISBN818749865X. .. the oath of office was taken by Dr. Rajendra Prasad, the President-elect of India, in the presence of the Chief Justice of India, as prescribed by the Constitution.
Debjani Chatterjee, ed. (1 December 2020). "Know About Dr Rajendra Prasad: A Brilliant Scholar And The First President". After his sister died on January 25, 1950, a day ahead of the historic moment when the Indian Constitution was going to come into force, Dr Rajendra Prasad attended the cremation only after the founding ceremony of the Republic of India.