Hãy liệt kê các phần tử của tập hợp X ={x thuộc R /2x2 -5x +3}

At a lunchron, guests are offered a selection of five different grilled vegetables and four different meats. in how many waya could one choose three vegetables and two meats?

20 da is equal to a. 2,000 cm. b. 2 m. c. 20,000 cm. d. 20,000 mm

Can someone answer this question? : )