The term independent of x in 1+x+2x23x22-13x9 is

In the expansion 3x22-13x9Tr+1=Cr   93x229-r·-13xr        =Cr   9329-r-13rx18-3rIf 18-3r=0, then r=6.If 18-3r=-1, then r=19/3.If 18-3r=-2, then r=20/3.⇒There are no terms containing 1x and 1x2 in the expansion of 3x22-13x9 ∴The term independent of x in the given expansion =C6   9323-136=C3   9163                                                                                            =84216=718