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Question

Find the term independent of x in the expansion of (x2+1x)9

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Solution

(x2+1x)9accordingtoquestion,Tr+1=9Cr(1x)r(x2)9r=9Crxrx182r=9Crx183rforr=6183r=0=9C6
Hence, term independent from x is 7th term which is 9C6=84

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