- Why is 0! equals 1 ?

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Hi Is it possible to calculate force between two parallel plates? How to find out if spouse takes photos? How do you find the number of valence electrons for elements in the d block? for example how many valence electrons would chromium have? ABCD is a trapezoid with AD parallel BC. If AD=8 cm and BC=14 cm, and if the area of the trapezoid is 166 cm^2, find the area of ABE? Why do we hydrolyse onion root tip cells before observing them under microscope when studying mitosis?