



Tương tự câu 163, xác suất lấy được viên bi xanh là bao nhiêu?
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$34.99
$29.99
Shipping and Returns Policy
- Deliver to United States » Shipping Policy «
- - Shipping Cost: $5.99
- - Handling time: 2-3 business days
- - Transit time: 7-10 business days
- Eligible for » Returns & Refund Policy « within 30 days from the date of delivery
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một hộp có 5 viên bi đỏ 3 viên bi vàng và 4 viên bi xanh
- Sau khi thêm 3 viên bi xanh, tổng số viên bi trong hộp là bao nhiêu?
- Không 138
- 5/12 (chỉ màu đỏ) 157
- (4/12) * (3/11) * (2/10) = 24/1320 40
- Không 120
- 13 141
- 3/4 49
- Nếu bạn muốn chắc chắn lấy được ít nhất hai viên bi vàng, bạn cần lấy ra ít nhất bao nhiêu viên bi?
- C(5, 5) / C(12, 5) = 1 / 792 181
- C(3, 2) * C(9, 1) / C(12, 3) = 3 * 9 / 220 = 27/220 188
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