21st letter from right = (27 - 21) = 6th letter from left
? Required middle letter = (20 + 6)/2 = 26/2
= 13th letter from left = M
Middle letter between 6th and 14th letter from left
= (6 + 14)/2 th letter from left
= (20/2) th
= 10th letter from left = J
18th letter from left = R
? 10th the left of R = 10th letter from left = H
7th letter from right = (27 -7)th = 20th letter from left
? Required middle letter = (8 + 20)/2
= 14th letter from left = N
6th letter from left = F
? 14th letter to the right of F = (6 + 14) th letter from left
= 20th letter from left = T
7th letter from left = G
? 8th letter to the right of G = (7 + 8) th letter from left
= 15th letter from left = O
14th letter from end = (27 - 21) = 6th letter from left
? Required middle letter = (20 + 6)/2 = 26/2
= 13th letter from left = M
Required middle letter = (4 + 16)/2 = 20/2
= 10th letter from left = J
Each tern of the series is obtained by removing two letters from the preceding term - one from the beginning and one from the the end. So, the missing term is PENDICU.
In the first step one letter from the beginning and one letter from the end of the term is removed to give the next term. in the second step two letters from the beginning of a term are removed. These two steps are repeated alternatively and thus the missing term is UTI.
Original word, V E R T I C A L
Alphabetically, A C E I L R T V
There is no letter which will remain at the same position
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