A. nCr(3r-2n)
B. nCr(3n-r-2n-r)
C. nCr(3r+2n-r)
D. none
nC0+nC1+nC2+………+nCn =
If the 5th term is 24 times the 3rd term in the expansion of (1+x)11 then x=
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The 4th term of (1-2x)-1 when x=1/3 is
If xr occurs in the expansion (x+1/x2)2n, then its coefficient is:
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