Gieo đồng thời hai con súc sắc cân đối đồng chất. Tìm xác suất để
a) tổng số chấm xuất hiện nhỏ hơn $8$
b) hiệu số chấm trên mặt hai con súc sắc có trị tuyệt đối bằng $2$
giải nhưng k pít đúng k. mọi người xem nhá

$\Omega =${$x,y$ \ $ 1\leqslant x,y\leqslant 6,x,y\in Z$} $=>\left| {\Omega } \right|=6.6=36$

gọi A là biến cố "tổng số chấm xuất hiện nhỏ nơn 8"
$\Omega_{A} = ${$(1;1); (1;2); (1;3); (1;4); (1;5); (1;6); (2;1); (2;2); (2;3); (2;4); (2;5); (3;1); (3;2); ( 3;3); (3;4); (4;1); (4;2); (4;3); (5;1); (5;2); (6;1)$}  $=>\left| {\Omega_A} \right|=21$

$=>P_{A}=\frac{21}{36}\approx 0.583$
uk đúng rôi khiêm tốn quá –  thuytruyentan123 29-11-15 10:44 AM

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