Number of permutations of AAABBBCCC such that no two A's or B's or C's together
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What was your approach? – DMH16 Feb 02 '18 at 11:36
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6A question mark was already too much? – Yuriy S Feb 02 '18 at 11:37
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2Welcome to MSE. It will be more likely that you will get an answer if you show us that you made an effort. – José Carlos Santos Feb 02 '18 at 11:38
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Maybe of interest https://math.stackexchange.com/questions/2632310/letter-arrangement-problems – cgiovanardi Feb 02 '18 at 22:10
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I tried inclusion exclusion principle. Assumed 3 sets X Y and Z..where X is atleast 2 A's together! Similar sets Y and Z... but that is getting too messy to solve! – parivesh badal Feb 03 '18 at 03:25
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Apparently a solution to this already exists! Apologies for bad manners! New to community... – parivesh badal Feb 03 '18 at 03:32