Section 2 sub-section 2 of Civil Servants Seniority Rules 1993 is relevant in this case, which is reproduced as under:

2. Seniority on initial appointment.–

(2) If two or more persons are recommended in open advertisement by
the selection authority their inter se seniority shall be determined in order of
merit assigned by the selection authority.

Regards

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'Thee woh ik shakhs kay tasawar saay - abb woh ranayee khayal kahaan'