this problem has been on my mind...(adsbygoogle = window.adsbygoogle || []).push({});

how many permutations can you make with 30 'A's and 30 'B's

or rather the same question, how many unique numbers can be made from 30 1s and 30 0s

any ideas?

(excluding permutations that look identical)

thanks

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# How many permutations?

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