For the expansion (5+2x)12, carry out the tasks given below.
(i) Write the general term Tr+1.
(ii) Determine the middle term T and the term immediately succeeding it, denoted T′, without simplifying their coefficients.
(iii) Compute the ratio TT′ and hence decide which of the two terms has the greater absolute value when x=1. Justify your answer with calculations.