self Maths Puzzle

Four of the following five groups of letters are alike in some way while one is different. Find out which one is different.
(a) ISLOJ
(b) LUOQM
(c) AKDGB
(d) FPILG
(e) NXQTO

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self Other Question

(i) A, B, C, D, E, F and G are seven members standing in a row (not necessarily in the same order) facing north.
(ii) C and B have as many members between them as G and C have between them.
(iii) D, who is 3rd from the extreme left, is 3rd to the left of E.
(iv) A and D are neiighbors and F and C are neighbors. Below are given six three-digit numbers. The digits comprise of numeric and letters. The letter indicates its serial order in the English alphabet. What will be the middle digit of the 4th number when the numbers are arranged in the descending order after interchanging numeric in each number without altering the place of letter in the number?
19F, 2H9, 98B, D76, 7A6, 61E
(a) 8
(b) 9
(c) 6
(d) 7
(e) None of these