কলম নিবা?


Rafin, Rahul, Zahid and Jubaer are in a group of 13 members. In how many total ways 6 red, 3 green and 4 blue pens can be distributed among them so that everyone gets 1 pen and Rafin and Zahid get the same colored pen but Rahul and Jubaer don't get the same colored pen?


Counting   Combinatorics  


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Attempt 335


Solve 93


First Solve qolympiad