/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: himangshushekharbiswas https://cdn.slidesharecdn.com/profile-photo-himangshushekharbiswas-48x48.jpg?cb=1523410155 Head of the dept.of math,govt. b.m.university college barisal,bangladesh.