a$.$ n$($n $+1)$ and $2000$n$?$

b$.100$n$?$ and $0\mathrm{.}01$n$3$

c$.$ log$2$ n and In n

d$.$ log$\}$ n and log n

e$.21-1$ and $2$n

f$.($n $-1)!$ and n$!$