Mathematics, 06.10.2019 03:30 bakerj5203

In the design of an electromechanical product, 12 components are to be stacked into a cylindrical casing in a manner that minimizes the impact of shocks. one end of the casing is designated as the bottom & the other end is the top.
a) if all components are different, how many different designs are possible?
b) if 7 components are the same, & others are different, how many different designs are possible?
c) if 3 components are of one type, and 4 of another, and other 5 are different, how many different designs are possible?

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