A. (3n+2)2n-1
B. (2n+3)3n-1
C. (2n+3)2n-1
D. (3n+2)3n-1
The number of terms which are free from radical signs in the expansion of (x1/5+y1/10)55 is
If the third term in the expansion of (1/x+ xlog10 x)5 is 1, then x=
2.C0+22.C1/2+23.C3/3+……..+2n+1.Cn/n+1 =
If n is odd then C02-C12+C22-……….+(-1)n Cn2 =
Coefficient of x50 in (1+x)1000+2x(1+x)999+3x2(1+x)998+……..+1001x1000 is