08/28/16
find no. of ways in which n'1' and n'2' can be arranged in row so that upto any point in a row no of 1 is more than no if 2
find no. of ways in which n'1' and n'2' can be arranged in row so that upto any point in a row no of 1 is more than no if 2
ans 2nCn /(n+1)
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