A and B are partners in a firm sharing profits in the ratio of 2 : 1. They admit C as a new partner for 1/5 share. New R
1 : 2 correct per NCERT Admission of a Partner; matches accountancy concept accurately.
Ref: NCERT Accountancy Class XII Chapter 3 Admission of Partner explains goodwill valuation sacrificing ratio revaluation reserves adjustment accounting treatment.