Cho mình xin câu trả lời chi tiết luôn nha mọi người Gieo một con súc sắc cân đối đồng chất hai lần. Tính xác suất để biến cố có tổng hai mặt bằng 7

2 câu trả lời

Ta có:

n($\Omega$) = $6^{2}$ = 36

Gọi A là biến cố " có tổng hai mặt bằng 7"

Ta có n(A) = {16; 25; 34; 61; 52; 43}

⇒ Xác xuất có tổng hai mặt bằng 7 là:

P(A) = $\frac{6}{36}$ = $\frac{1}{6}$ 

 

Đáp án:6

 

Giải thích các bước giải:bạn dở trang 60/sgk11 cộng lại lấy tống =7 là đc 

 

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