There are 10 companies including a and b, to select 4 companies to participate in a project, what’s the probability that a, b are selected at the same time?

Which one of the following statements is correct? process costing systems use periodic inventory systems. process costing systems assign costs to departments or processes for a time period. companies that produce many different products or services are more likely to use process costing systems. production is continuous when a job-order costing is used to ensure that adequate quantities are on hand.