# 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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