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there are 4 options, though C(50,25) is an option but the ans given at the back is
C(100,51)

sorry i actually need to prove it
it should be C(2n,n-1) or C(2n,n+1) hence answer is correct ..

i shall get back to you,,please gimme some time..

if possible sure ..

as i hardly remain online...

here u take (1+x)^100 *(x+1)^200 =(1+x)^300

okay,,following..

sir ? hmm..?

nCr = nC(n-r)

Woops
\[ \sum_{k=0}^{49}\binom{50}{k} \binom{50}{49-k} \]

thank you :)