When an Ordinary Bill is referred to a joint sitting of both the Houses of Indian Parliament, it has to be passed by a :

According to Article 108 of the Indian Constitution, when an Ordinary Bill is referred to a joint sitting of both Houses of Parliament to resolve a deadlock, it is decided by a simple majority. Specifically, the bill is deemed passed if it receives the support of a majority of the total number of members of both Houses present and voting [4]. This voting procedure excludes the presiding officer, who only exercises a casting vote in the event of a tie [2]. The quorum required for such a sitting is one-tenth of the total members of both Houses [3]. While Constitutional Amendment Bills and Money Bills are exempt from this provision, Ordinary Bills and Financial Bills (Type I and II) follow this simple majority rule during a joint session to ensure legislative continuity [t1][t4].

Sources

1. [1] Laxmikanth, M. Indian Polity. 7th ed., McGraw Hill. > Chapter 23: Parliament > Voting in House > p. 237
2. [3] Indian Polity, M. Laxmikanth(7th ed.) > Chapter 23: Parliament > JOINT SITTING OF TWO HOUSES > p. 250
3. [4] https://cms.rajyasabha.nic.in/UploadedFiles/Legislation/Introduction.pdf
4. [2] Laxmikanth, M. Indian Polity. 7th ed., McGraw Hill. > Chapter 23: Parliament > JOINT SITTING OF TWO HOUSES > p. 250