Four options are given below. Three of these options are similar to each other because they follow the same pattern. Identify the option that is dissimilar to the other three ?

A. AE6

B. FD10

C. AD6

D. DE9

Answer : C. AD6

Explanation

The general sequence is :
Position of the first letter in the alphabet sequence + Position of the second letter in the alphabet sequence = the number at the end of each term.

Thus, AE6 => 1 + 5 = 6
FD10 => 6 + 4 = 10
DE9 => 4 + 5 = 9
Going by this logic, AD6 does not fit the sequence. It should have been AD5 (1 + 4 = 5).
Therefore, the option that is dissimilar to the other three is AD6.

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