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If each receives atleast 2 books, then the division as shown by three diagrams. <br> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/ARH_SKG_ALG_C05_SLV_076_S01.png" width="80%"> <br> The number of division ways for tree diagram (i), (ii) and (iii) are <br> `(9!)/((2!)^(2)(5!))xx(1)/(2!),(9!)/(2!3!4!) and (9!)/((3!)^(3))xx(1)/(3!)`, respectively. <br> Hence, the total number of ways of distribution of these groups among 3 students is <br> `[(9!)/((2!)^(2)(5!))xx(1)/(2!)+(9!)/(2!3!4!)+(9!)/((3!)^(3))xx(1)/(3!)]xx3!` <br> `=[378+1260+280]xx6` <br> `=11508`