http://niberus.livejournal.com/ ([identity profile] niberus.livejournal.com) wrote in [community profile] ru_chgk 2013-12-03 06:26 am (UTC)

Скорее у дедушки Виленкина. "Популярная комбинаторика", с.43
http://gen.lib.rus.ec/get?md5=4C8EE3AD7404398D0DF4375C5A5DD6FD&open=0
(355 comments)

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