The quorum for Joint Sitting of the Indian Parliament is

The quorum required to constitute a joint sitting of the Indian Parliament is one-tenth of the total number of members of both Houses [c1][c2]. Under Article 108 of the Indian Constitution, the President may summon a joint sitting to resolve a legislative deadlock between the Lok Sabha and the Rajya Sabha [t2]. While Article 100(3) specifies that the quorum for a meeting of either House is one-tenth of its total membership, the same proportion applies to a joint session [t3][t4]. Specifically, the joint sitting is governed by the Rules of Procedure of the Lok Sabha [c1]. In this setting, the total membership is the combined strength of both Houses, and at least one-tenth of this aggregate must be present to transact business. If the quorum is not met, the presiding officer must adjourn or suspend the meeting [c3].

Sources

1. [1] Indian Polity, M. Laxmikanth(7th ed.) > Chapter 23: Parliament > JOINT SITTING OF TWO HOUSES > p. 250
2. [2] Laxmikanth, M. Indian Polity. 7th ed., McGraw Hill. > Chapter 23: Parliament > JOINT SITTING OF TWO HOUSES > p. 250
3. [3] Laxmikanth, M. Indian Polity. 7th ed., McGraw Hill. > Chapter 23: Parliament > Quorum > p. 237
4. [4] https://en.wikipedia.org/wiki/Joint_session_of_the_Parliament_of_India