Question: i am having trouble figuring this problem. how do m I know when to use nPr or nCr? 10 democrates & republicans 4 independents. Suppose

i am having trouble figuring this problem. how do m I know when to use nPr or nCr?

i am having trouble figuring this problem. how do m I know

10 democrates & republicans 4 independents. Suppose two groups are randomly selected, in succession, to attend a poutical convention. Find the probability of selecting two independents

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