Let K be the sum of the coefficients of the odd powers of x in the expansion of (1+x)99. Let a be the middle term in the expansion of (2+12)200.
If C99K200a=2lmn, where m and n are odd numbers, then the ordered pair (l,n) is equal to
(A) (50, 101) (B) (51, 101) (C) (51, 99) (D) (50, 51)
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