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by hand: How many paths are there from the point (0,0) to the point (10,20) in...

by hand:

How many paths are there from the point (0,0) to the point (10,20) in the plane such that each step either consists of going one unit up or one unit to the right? Explain your answer. If your answer contains large powers or binomial coefficients, there is no need to calculate them.

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If one need to reach (10,20) (10,20) Starting from 10,0), he needs to take exactly 10 steps towards right and 20 towards up i

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