প্রশ্ন ও সমাধান

The students of IBA debating club will publish three Magazines in 2012 one each in January, April and August. Seven students namely Arshad. Behroz, Dipu, Emon, Faruk, Rashed, and Sakib -have each submitted one or more articles.Each of the seven students will have at least one article published, but some may have more than one article published. The following restrictions apply to the publication of their articles:Each of the magazines must contain at least two articles.An article by Rashed cannot be published in a magazine that contains an article by Sakib.If an article by Arshad appears in a magazine, then an article by Behroz must also appear in that magazine.If an article by Emon appears in a magazine, then an article by Rashed must appear in the immediately preceding magazine.No author may publish in each of two consecutively published magazines or twice in the same magazine.The magazine published in January can consist exclusively of articles by which of the following groups of authors?