A line segment contains endpoints A (2,9) and B (2,3).
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We are given that car dealership employed 4 mechanics. and 20 cars came there.
That means each employee should handle
Which means we need to choose 5 cars from 20 cars first . For that we need to use combinations since order in which car is given to mechanic does not matter.
Hence number of ways = =
= 15504 ways of allocating.