Let G be a finite p-groups and ΦNA1M(G) the intersection of all maxi-mal subgroups which are not minimal non-abelian in G.This paper proves|G:ΦN.A1A,M(G)|≤p3and classify fmite p-groups with|G:ΦN.A1M(G)|p,p2and p3,respectivel y. As a corollary,This solves a problem proposed by Berkovich and Janko in their book "Groups of Prime Power of Order Vol.3"... |