Q7 of 36 Page 171

Find the middle terms in the expansions of

Here n = 7 so there would be two middle terms given by


Now


For T4 , r= 3


The term will be


Tr+1 = nCr an-r br





For T5 term , r = 4


The term Tr+1 in the binomial expansion is given by


Tr+1 = nCr an-r br




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