Appointment of auditors

Hi, Good Evening...!! I have a query related to section 139(1) and 139(6) The provision of section 139(1) are applicable to all companies (whether public or private, whether having a share capital or not, whether listed or unlisted, and irrespective of its paid up share capital, borrowings etc.) At the first AGM, every company shall appoint an auditor. the auditor so appointed shall hold office from the conclusion of first AGM till the conclusion of sixth AGM. But at the same time section 139(6) says this section is applicable to any other company and auditor shall hold office till the conclusion of the first AGM. Can anyone give the applicability of above two section. thanks.