Find the number of ways in which n '1' and n '2' can be arranged in a row that up to any point in the row numbers of '1' is more than or equal to numbers of '2'.
This is the same question asked by me in August 2017, and the answer was that it is a Catalan number.
Me and my team are trying to prove this result but not able to deduce the result which is the Catalan Number. I just need to prove that the result is the CATALAN NUMBER.