Central idea of my mother at sixty-six//board exam Most important central idea

Consider two covalent compounds AL_(n_(1)) and BL_(n_(2)) , if central atom (A) of first compounds has total six electron pairs and central atom (B) of second compound contains total five electron pairs in its valence shell and both compounds are planar and non-polar then calculate value of experssion (n_(1)-n_(2))^(2) . [Where n_(1) and n_(2) are number of monovalent surrounding atom (L)]

Consider two covalent compounds AL_(n_(1)) and BL_(n_(2)) , if central atom (A) of first compounds has total six electron pairs and central atom (B) of second compound contains total five electron pairs in its valence shell and both compounds are planar and non-polar then calculate value of experssion (n_(1)-n_(2))^(2) . [Where n_(1) and n_(2) are number of monovalent surrounding atom (L)]