The Prime Minister's four sets of nomination papers endorsed by 40 MLAs submitted under oath before the Returning Officer were found in order, Assembly sources said.
Singh filed a fresh affidavit two days ago correcting his age from 82 to 80 years in the nomination papers for the May 30 elections, they said.
Under the rules, there was time until yesterday for making corrections in the nomination papers, the sources said.
The nomination papers of Congress candidate Santius Kujur and AIUDF contestant Aminul Islam for the second RS seat from the state were also found valid after scrutiny, they said.
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The nomination papers of independent candidate K Padmanarayan were found invalid as he had failed to provide the names of MLA proposers, the sources added.
May 23 is the last date for withdrawal of candidature for the two seats, for which elections are being held, out of seven from the state.