Q. 64.1( 47 Votes )
Find the 13th term in the expansion of 
Answer :
The general term Tr+1 in the binomial expansion is given by Tr+1 = nCr an-r br
Here a=9x , 
, n =18 and r = 12
Putting values
= 
(9 = (32)6 = 312)
= 18564
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