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I think (99)100 is the ans,bcoz
(99)100=(99)99+(99)99+........99 times.
(100)99=(99+1)99=(99)99+99c1(99)98+99c2(99)97+.......+1
In the second expansion,From the third term onwards,the terms are very less compared to those of first expansion.Hence the ans.
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