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question an instructor gives an exam with fourteen questions students are allowed to choose any ten to answera how many
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question a define a derangementb why is counting the number of ways a hatcheck person can return hats to n people so
question a how can you count the number of ways to assign m jobs to n employees so that each employee is assigned at
question a give a formula for the number of elements in the union of four sets and explain why it is validb suppose the
question a explain how to find a recurrence relation for the number of bit strings of length n not containing two
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question observe that the sequence 12 15 8 13 7 18 19 11 14 10 has three increasing subsequences of length four 12 15
question a suppose a1 a2 an is a sequence of n integers none of which is divisible by n show that at least one of the
question let s be a set of ten integers chosen from 1 through 50 show that the set contains at least two different but