Q. 64.1( 52 Votes )

# Find the 13^{th} term in the expansion of

Answer :

The general term T_{r+1} in the binomial expansion is given by T_{r+1} = ^{n}C_{r} a^{n-r} b^{r}

Here a=9x , , n =18 and r = 12

Putting values

= (9 = (3^{2})^{6} = 3^{12})

= 18564

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