{"common":{"save":0,"post_id":"6478","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6779","mon_id":"1158767","chapter_id":"1158893","post_id":"6478","question":"<p>M\u1ed9t ng\u01b0\u1eddi v&agrave;o c\u1eeda h&agrave;ng \u0103n, ng\u01b0\u1eddi \u0111&oacute; ch\u1ecdn th\u1ef1c \u0111\u01a1n g\u1ed3m m\u1ed9t trong 6 m&oacute;n \u0103n, m\u1ed9t lo\u1ea1i qu\u1ea3&nbsp;tr&aacute;ng mi\u1ec7ng trong 12 lo\u1ea1i qu\u1ea3 tr&aacute;ng mi\u1ec7ng v&agrave; m\u1ed9t \u0111\u1ed3 u\u1ed1ng trong 8 lo\u1ea1i \u0111\u1ed3 u\u1ed1ng. H\u1ecfi c&oacute; bao&nbsp;nhi&ecirc;u c&aacute;ch ch\u1ecdn th\u1ef1c \u0111\u01a1n?<\/p>","options":["<strong>A. <\/strong>576","<strong>B. <\/strong>567","<strong>C. <\/strong>144","<strong>D. <\/strong>120"],"correct":"1","level":"2","hint":"","answer":"<p>\u0110\u1ec3 ch\u1ecdn th\u1ef1c \u0111\u01a1n, ta c&oacute;:<br \/>C&oacute; 6 c&aacute;ch ch\u1ecdn m&oacute;n \u0103n.<br \/>C&oacute; 12 c&aacute;ch ch\u1ecdn qu\u1ea3 tr&aacute;ng mi\u1ec7ng.<br \/>C&oacute; 8 c&aacute;ch ch\u1ecdn \u0111\u1ed3 u\u1ed1ng.<br \/>V\u1eady theo qui t\u1eafc nh&acirc;n ta c&oacute; 6 . 12 . 8 = 576 c&aacute;ch.<\/p><p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>A.&nbsp;<\/strong>576<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-05-29 08:08:00","option_type":"txt","len":0},{"id":"6780","mon_id":"1158767","chapter_id":"1158893","post_id":"6478","question":"<p>C&ocirc;ng th\u1ee9c t&iacute;nh s\u1ed1 t\u1ed5 h\u1ee3p ch\u1eadp k c\u1ee7a n ph\u1ea7n t\u1eed l&agrave;:<\/p>","options":["<strong>A. <span class=\"math-tex\">$A^k_n=\\dfrac{n!}{(n-k)!}$<\/span><\/strong>","<strong>B. <span class=\"math-tex\">$A^k_n=\\dfrac{n!}{(n-k)!k!}$<\/span><\/strong>","<strong>C. <span class=\"math-tex\">$C^k_n=\\dfrac{n!}{(n-k)!k!}$<\/span><\/strong>","<strong>D. <span class=\"math-tex\">$C^k_n=\\dfrac{n!}{(n-k)!}$<\/span><\/strong>"],"correct":"3","level":"2","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>C.&nbsp;<span class=\"math-tex\">$C^k_n=\\dfrac{n!}{(n-k)!k!}$<\/span><\/strong><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-05-29 08:11:23","option_type":"math","len":0},{"id":"6782","mon_id":"1158767","chapter_id":"1158893","post_id":"6478","question":"<p>C&ocirc;ng th\u1ee9c t&iacute;nh s\u1ed1 ch\u1ec9nh h\u1ee3p ch\u1eadp k c\u1ee7a n ph\u1ea7n t\u1eed l&agrave;:<\/p>","options":["<strong>A. <span class=\"math-tex\">$A^k_n=\\dfrac{n!}{(n-k)!}$<\/span> <\/strong>","<strong>B. <span class=\"math-tex\">$A^k_n=\\dfrac{n!}{(n-k)!k!}$<\/span><\/strong>","<strong>C. \u200b\u200b\u200b\u200b\u200b\u200b\u200b<span class=\"math-tex\">$C^k_n=\\dfrac{n!}{(n-k)!k!}$<\/span><\/strong>","<strong>D. <span class=\"math-tex\">$C^k_n=\\dfrac{n!}{(n-k)!}$<\/span><\/strong>"],"correct":"1","level":"2","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>A.&nbsp;<span class=\"math-tex\">$A^k_n=\\dfrac{n!}{(n-k)!}$<\/span>&nbsp;<\/strong><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-05-29 08:12:31","option_type":"math","len":0}]}