What are the function of the base and the arm of the microscope?


120 ways


n = 6

r = 3


P (n,r) = \frac{n!}{(n-r)!} \\ P (6,3) = \frac{6!}{(6-3)!} \\P (6,3) = \frac{6!}{(3)!} \\ P (6,3) = \frac{6x5x4x3x2x1}{3x2x1} \\ P (6,3) = \frac{720}{6} \\\left[\begin{array}{ccc} P (6,3) = 120\end{array}\right]

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Support the optical parts of microscope

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