The Election Commission today announced bypolls to one Lok Sabha and nine Assembly seats which would be held on May 16.
National People's Party chief Sangma had died here on March 4 following a massive heart attack.
PDP leader Sayeed had died in harness as the chief minister on January 7 at the All India Institute of Medical Sciences in Delhi where he was undergoing treatment for pneumonia.
The notification for the bypolls will be issued on April 22, while counting will take place on May 19 -- along with counting of votes in West Bengal, Assam, Tamil Nadu, Kerala and Puducherry, which are having Assembly polls.