Question: Matthew works as a computer operator at a small university. One evening he finds that 12 computer programs have been submitted earlier that day for

Matthew works as a computer operator at a small university. One evening he finds that 12 computer programs have been submitted earlier that day for batch processing. In how many ways can Matthew order the processing of these programs if
(a) There are no restrictions?
(b) He considers four of the programs higher in priority than the other eight and wants to process those four first?
(c) He first separates the programs into four of top priority, five of lesser priority, and three of least priority, and he wishes to process the 12 programs in such a way that the top-priority programs are processed first and the three programs of least priority are processed last?

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