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How many permutations are there of 20 objects when taken 6 objects at a time, if a particular one of these objects must always
How many permutations are there of 20 objects when taken 6 objects at a time, if a particular one of these objects must always be included? a. 6(20 1)/(20-6)! - O b. 20(20 1)!/(20-6-2)! O c. (20-1)/(20-6-2)! O d. 6(20)!/(20-6)!
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