नेपाल, भारत र बेलायतबिच त्रिपक्षिय सम्झौता कहिले भएको थियो ?
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Answer: B) सन् १९४७ नोभेम्बर ९
The tripartite agreement on Gurkha army recruitment among Nepal, India and Britain was signed on 9 November 1947, as the question note states.
Source: Scan #24 page 1 Q13