If they must form an ethics subcommittee of 4 members how, Ask an Expert

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There are 12 members on the board of directions at a hospital.

a. If they must elect a chairperson, first vice chairperson, second vice chairperson and secretary, how many different stages of candidates are possible?

b. If they must form an ethics subcommittee of 4 members, how many different subcommittees are possible?

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