Fr numbers are selected from the set -5-4-3-2-11234 in


Four numbers are selected from the set: {-5,-4,-3,-2,-1,1,2,3,4} . In how many ways can the selections be made so that the product of the numbers is positive and:

a) The numbers are distinct.

b) Each number may be selected as many as four times.

c) Each number may be selected at most three times.

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Algebra: Fr numbers are selected from the set -5-4-3-2-11234 in
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