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
Position of R from left = 18
? 5th letter to the left of R = 5th letter before R
= (18 - 5)th = 13th letter = M
Required letter = (27 - 10) th = 17th letter from left = Q
Middle letter between 6th and 14th letter from left
= (6 + 14)/2 th letter from left
= (20/2) th
= 10th letter from left = J
21st letter from right = (27 - 21) = 6th letter from left
? Required middle letter = (20 + 6)/2 = 26/2
= 13th letter from left = M
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.
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