Answer :

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

Now

For T_{4} , r= 3

The term will be

T_{r+1} = ^{n}C_{r} a^{n-r} b^{r}

For T_{5} term , r = 4

The term T_{r+1} in the binomial expansion is given by

T_{r+1} = ^{n}C_{r} a^{n-r} b^{r}

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