Một hộp có 15 sản phẩm tốt và 5 sản phẩm xấu. Chọn ngẫu nhiên lần lượt không hoàn lại 3 sản phẩm từ hộp. Có bao nhiêu cách để chọn:
a. Ba sản phẩm từ hộp.
b. Ba sản phẩm đều là tốt.
c. Có 2 sản phẩm tốt và 1 sản xấu được chọn

Emma will roll two number cubes labeled 1 through 6. she will record the sum of the two numbers after each roll. she will roll the two cubes 540 times. how many times should emma expect the sum to equal 5?

Ametal rod needs to be 9 feet and 5.5 inches in length. the sections of the poles being used are each 1 foot and 10.5 inches long. how many 1ft 10.5in sections would be needed to complete the 9ft 5.5in metal rod? and how many inches of material will be left?

Graph the system of inequalities presented here on your own paper, then use your graph to answer the following questions: y < 4x − 8 y is greater than or equal to negative 5 over 2 times x plus 5 part a: describe the graph of the system, including shading and the types of lines graphed. provide a description of the solution area. (6 points) part b: is the point (5, −8) included in the solution area for the system? justify your answer mathematically. (4 points)