Which among the following is referred to as the perfection principle?

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E6 Psychology Baron Misra 5e Part 2 p. 84-86
E6 Kaplan Sadock's Synopsis of Psychiatry-2022 (pp 1-3768 of 3768) p. 3338-3340
Practise the full RRB Nsg. Superintendent-20 July 2019 (Shift-2)
Attempt every question from this paper in a timed mock, then review the full solution for each one.