{"id":1823,"date":"2009-06-20T18:23:38","date_gmt":"2009-06-21T02:23:38","guid":{"rendered":"http:\/\/www.oeconomist.com\/blogs\/daniel\/?p=1823"},"modified":"2009-06-20T18:23:38","modified_gmt":"2009-06-21T02:23:38","slug":"irksome-declaration","status":"publish","type":"post","link":"https:\/\/www.oeconomist.com\/blogs\/daniel\/?p=1823","title":{"rendered":"Irksome Declaration"},"content":{"rendered":"<p>In looking for an established notation for a particular sort of <span style=\"font-style: italic ;\">permutation<\/span>, I have run across a large number of tutorials that declare that the notation and formula for <q>a permutation<\/q> is <blockquote><sub><var>n<\/var><\/sub>P<sub><var>r<\/var><\/sub> = <var>n<\/var>! \/ (<var>n<\/var> - <var>r<\/var>)!<\/blockquote> This claim complete confuses the concept of a <span style=\"font-style: italic ;\">permutation<\/span> with the <em>count<\/em> of possible permutations.  It's rather like saying that an American is 306,719,000.<\/p>","protected":false},"excerpt":{"rendered":"In looking for an established notation for a particular sort of permutation, I have run across a large number of tutorials that declare that the notation and formula for a permutation is nPr = n! \/ (n - r)! This claim complete confuses the concept of a permutation with the count of possible permutations. It's [&hellip;]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":""},"categories":[6,117,4],"tags":[202,99],"class_list":["post-1823","post","type-post","status-publish","format-standard","hentry","category-commentary","category-communication","category-public","tag-everyday-frustrations","tag-mathematics"],"_links":{"self":[{"href":"https:\/\/www.oeconomist.com\/blogs\/daniel\/index.php?rest_route=\/wp\/v2\/posts\/1823","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oeconomist.com\/blogs\/daniel\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.oeconomist.com\/blogs\/daniel\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.oeconomist.com\/blogs\/daniel\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.oeconomist.com\/blogs\/daniel\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1823"}],"version-history":[{"count":0,"href":"https:\/\/www.oeconomist.com\/blogs\/daniel\/index.php?rest_route=\/wp\/v2\/posts\/1823\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.oeconomist.com\/blogs\/daniel\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1823"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oeconomist.com\/blogs\/daniel\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1823"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oeconomist.com\/blogs\/daniel\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1823"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}