5. [0/1 Points] DETAILS PREVIOUS ANSWERS EPPDISCMATH5 9.2.015. Suppose a certain combination lock requires three selections of numbers, each from 1 through 20. (a) How many different combinations are possible? 6840 X Need Help? Read It (b) Suppose the locks are constructed in such a way that no number may be used twice. How many different combinations are possible? MY NO

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