Toán lớp 11 - Đề kiểm tra 45 phút - Toán lớp 11 - Tháng 11 - Số 1

{"save":1,"level":1,"time":"45","total":20,"point":5,"segment":[{"id":"188","test_id":"209","question":"<p>C&ocirc;ng th\u1ee9c n&agrave;o sau \u0111&acirc;y d&ugrave;ng \u0111\u1ec3 t&iacute;nh x&aacute;c su\u1ea5t c\u1ee7a bi\u1ebfn c\u1ed1 A:<\/p>","options":["A.&nbsp;<span class=\"math-tex\">$P\\left( A \\right) = \\dfrac{{n\\left( A \\right)}}{{n\\left( \\Omega \\right)}}$<\/span>","B.&nbsp;<span class=\"math-tex\">$P\\left( A \\right) = 1-\\dfrac{{n\\left( A \\right)}}{{n\\left( \\Omega \\right)}}$<\/span>","C.&nbsp;<span class=\"math-tex\">$P\\left( A \\right) = \\dfrac{{n\\left( A \\right)}}{{n\\left( B \\right)}}$<\/span>","D.&nbsp;<span class=\"math-tex\">$P\\left( A \\right) = \\dfrac{{n\\left( \\Omega \\right)}}{{n\\left( A \\right)}}$<\/span>"],"correct":"1","answer":"<p>Theo l&yacute; thuy\u1ebft v\u1ec1 x&aacute;c su\u1ea5t c\u1ee7a bi\u1ebfn c\u1ed1 A ta c&oacute;&nbsp;<span class=\"math-tex\">$P\\left( A \\right) = \\dfrac{{n\\left( A \\right)}}{{n\\left( \\Omega \\right)}}$<\/span><\/p><p>\u0110&aacute;p &aacute;n A<\/p>","type":"choose","user_id":"88","test":"0","date":"2020-03-13 12:15:08"},{"id":"189","test_id":"209","question":"<p>Bi\u1ebft&nbsp;<span class=\"math-tex\">$C_n^2=66$<\/span>. Gi&aacute; tr\u1ecb c\u1ee7a&nbsp;<span class=\"math-tex\">$A_n^2=$<\/span><\/p>","options":["A. 56","B. 182","C. 132","D. 90"],"correct":"3","answer":"<p>Ta c&oacute;&nbsp;<span class=\"math-tex\">$C_n^2 = 66 $<\/span><span class=\"math-tex\">$\\Leftrightarrow \\dfrac{{n!}}{{\\left( {n - 2} \\right)!.2!}} = 66$<\/span><span class=\"math-tex\">$\\Leftrightarrow n\\left( {n - 1} \\right) = 132$<\/span><\/p><p>M\u1eb7t kh&aacute;c&nbsp;<span class=\"math-tex\">$A_n^2 = \\dfrac{{n!}}{{\\left( {n - 2} \\right)!}} = n\\left( {n - 1} \\right) = 132$<\/span><\/p><p>\u0110&aacute;p &aacute;n C<\/p>","type":"choose","user_id":"88","test":"0","date":"2020-03-13 12:17:00"}]}