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A delegation of four students is to be s...

A delegation of four students is to be selected from al total of 12 students. In how many says can the delegation be selected. if all the students are equally willing? if two particular students have to be included in the delegation? if two particular students do not wish to be together in the delegation? if two particular students wish to be included together only in the  delegation? if two particular students refuse to be together and two other particular students wish to be together only in the delegation?

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