{"common":{"save":0,"post_id":"7146","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6012","post_id":"7146","mon_id":"1158924","chapter_id":"1159182","question":"<p>H\u1ed9p th\u1ee9 nh\u1ea5t \u0111\u1ef1ng 4 bi xanh \u0111\u01b0\u1ee3c \u0111ánh s\u1ed1 l\u1ea7n l\u01b0\u1ee3t t\u1eeb 1 \u0111\u1ebfn 4. H\u1ed9p th\u1ee9 hai \u0111\u1ef1ng 3 bi \u0111\u1ecf \u0111\u01b0\u1ee3c \u0111ánh s\u1ed1 l\u1ea7n l\u01b0\u1ee3t t\u1eeb 1 \u0111\u1ebfn 3. L\u1ea5y ra ng\u1eabu nhiên t\u1eeb m\u1ed7i h\u1ed9p m\u1ed9t viên bi. G\u1ecdi A là bi\u1ebfn c\u1ed1 "T\u1ed5ng các s\u1ed1 ghi trên 2 bi là 5" và B là bi\u1ebfn c\u1ed1 "Tích các s\u1ed1 ghi trên 2 bi là s\u1ed1 ch\u1eb5n". Tính s\u1ed1 ph\u1ea7n t\u1eed c\u1ee7a bi\u1ebfn c\u1ed1 AB.<\/p>","options":["<strong>A.<\/strong> 3","<strong>B.<\/strong> 2","<strong>C.<\/strong> 4","<strong>D.<\/strong> 5"],"correct":"1","level":"3","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>A.<\/strong> 3.<\/span><\/p><p>A = {(2 ; 3) ; (3 ; 2) ; (4 ; 1)}<\/p><p>B = {(1 ; 2) ; (2 ; 1) ; (2 ; 2) ; (2 ; 3) ; (3 ; 2) ; (4 ; 1) ; (4 ; 2) ; (4 ; 3)}<\/p><p>AB = {(2 ; 3); (3 ; 2) ; (4 ; 1)}<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-05-31 05:21:01","option_type":"txt","len":0},{"id":"6013","post_id":"7146","mon_id":"1158924","chapter_id":"1159182","question":"<p>M\u1ed9t h\u1ed9p có 30 t\u1ea5m th\u1ebb cùng lo\u1ea1i \u0111\u01b0\u1ee3c \u0111ánh s\u1ed1 l\u1ea7n l\u01b0\u1ee3t t\u1eeb 1 \u0111\u1ebfn 30. L\u1ea5y ng\u1eabu nhiên 1 th\u1ebb t\u1eeb h\u1ed9p. G\u1ecdi A là bi\u1ebfn c\u1ed1 "S\u1ed1 ghi trên th\u1ebb \u0111\u01b0\u1ee3c ch\u1ecdn chia h\u1ebft cho 3". G\u1ecdi B là bi\u1ebfn c\u1ed1 "S\u1ed1 ghi trên th\u1ebb \u0111\u01b0\u1ee3c ch\u1ecdn chia h\u1ebft cho 4". Mô t\u1ea3 bi\u1ebfn c\u1ed1 AB .<\/p>","options":["<strong>A.<\/strong> {3; 6; 9; 12; 15; 18; 21; 24; 27; 30}","<strong>B.<\/strong> {4;8;12;16;20;24;28}","<strong>C.<\/strong> {12;24}","<strong>D.<\/strong> {3; 4; 6; 8; 9; 12; 15; 16; 18; 20; 21; 24; 27; 28; 30}"],"correct":"3","level":"3","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> {12;24}.<\/span><\/p><p>A = {3;6;9;12;15;18;21;24;27;30}<\/p><p>B = {4;8;12;16;20;24;28}<\/p><p>AB là bi\u1ebfn c\u1ed1 "S\u1ed1 ghi trên th\u1ebb \u0111\u01b0\u1ee3c ch\u1ecdn chia h\u1ebft cho 12" (vì 12 là b\u1ed9i chung nh\u1ecf nh\u1ea5t c\u1ee7a 3 và 4).<\/p><p>AB = {12 ; 24}.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-05-31 05:25:57","option_type":"txt","len":3},{"id":"6014","post_id":"7146","mon_id":"1158924","chapter_id":"1159182","question":"<p>M\u1ed9t h\u1ed9p có ch\u1ee9a 5 bi xanh và 4 bi \u0111\u1ecf có cùng kích th\u01b0\u1edbc và kh\u1ed1i l\u01b0\u1ee3ng. L\u1ea5y ra ng\u1eabu nhiên \u0111\u1ed3ng th\u1eddi 3 viên bi t\u1eeb h\u1ed9p. G\u1ecdi A là bi\u1ebfn c\u1ed1 "Ba viên bi l\u1ea5y ra \u0111\u1ec1u có màu \u0111\u1ecf", B là bi\u1ebfn c\u1ed1 "Ba viên bi l\u1ea5y ra \u0111\u1ec1u có màu xanh". Tính s\u1ed1 k\u1ebft qu\u1ea3 thu\u1eadn l\u1ee3i cho bi\u1ebfn c\u1ed1 A ∪ B.<\/p>","options":["<strong>A.<\/strong> 14","<strong>B.<\/strong> 13","<strong>C.<\/strong> 19","<strong>D.<\/strong> 44"],"correct":"1","level":"3","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>A.<\/strong> 14.<\/span><\/p><p>S\u1ed1 k\u1ebft qu\u1ea3 thu\u1eadn l\u1ee3i c\u1ee7a bi\u1ebfn c\u1ed1 A là <span class=\"math-tex\">$C_4^3=4$<\/span>.<\/p><p>S\u1ed1 k\u1ebft qu\u1ea3 thu\u1eadn l\u1ee3i c\u1ee7a bi\u1ebfn c\u1ed1 B là <span class=\"math-tex\">$C_5^3=10$<\/span>.<\/p><p>A ∪ B là bi\u1ebfn c\u1ed1 "Ba viên bi l\u1ea5y ra có cùng màu".<\/p><p>S\u1ed1 k\u1ebft qu\u1ea3 thu\u1eadn c\u1ee7a bi\u1ebfn c\u1ed1 A ∪ B là 4 + 10 = 14.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-05-31 05:36:23","option_type":"txt","len":0}]}