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shefali sharma Grade: 12
        10 different books and 2 different pen are given to 3 boys so that each get equal no. of things.Probability that same boy doesn't receive both pens is__________


ans:8/11
7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear shefali


probability of same boy doesn't receive both pens = 1 - probabilty of any  boy  receive both pens


since all the student recieves same number of article.so each one get (10+2)/3 =4         


number of ways in which 10 books and 2 pen is distributed to 3 student is =12C4 8C4 4C4


 now find the number of ways such that any boy recieve the both pen...


select one boy from 3 and give both pen to him in = 3C1 * 1 ways


 rest two article can be given to this boy in = 10C2 ways 


  other 2 boys will get article in 8C4 *4C4 ways


so number of ways such that any boy recieve the both pen= 3C1 * 1*10C2 *8C4 *4C4


so required probability = 1- 3C1 * 1*10C2 *8C4 *4C4 / 12C4 8C4 4C4


                                          =8/11


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Badiuddin


 



7 years ago
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