(i) Here,
n = 20 (Even number)
Therefore, the middle term is the th term, i.e., the 11th term.
(ii) Here,
n = 12 (Even number)
Therefore, the middle term is the i.e. 7th term
(iii) Here,
n = 10 (Even number)
Therefore, the middle term is the i.e. 6th term
(iv) Here,
n = 10 (Even number)
Therefore, the middle term is the i.e. 6th term