Q. 324.4( 5 Votes )

Show that the expansion of does not contain any term involving x9.

Answer :

For ,

a=2x2, and n=20

We have a formula,

To get coefficient of x9 we must have,

(x)40-3r = (x)9

• 40 - 3r = 9

• 3r = 31

• r = 10.3333

As is not possible

Therefore, the term containing x9 does not exist in the expansion of

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