1. During the essay writing stage of MBA admission process in a reputed B-School, each group consists of 10 students. In one such group, two students are batchmates from the same IIT department. Assuming that the students are sitting in a row, the number of ways in which the students can sit so that the two batchmates are not sitting next to each other, is:





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  • By: anil on 05 May 2019 02.39 am
    Consider the case where batchmates are sitting together and then subtract those cases from total no. of cases. When 10 students are arranged in a line, total arrangements possible are 10! Now considering batchmates sitting together,  Then total arrangements possible are 9!*2! Total ways = 10! - 9!*2! 9!*8 =  2903040
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