Three of the following four terms are alike in some manner and thus form a group. Identify the term that DOES NOT belong to that group.

Logic: Middle number = Difference between positions of 1st and 3rd letter

D = 4

L = 12

Difference = 12 – 4 = 8 (Match)

C = 3, J = 10

Difference = 10 – 3 = 7 $$\neq$$​ 6 
Doesn’t match

A = 1, C = 3

Difference = 3 – 1 = 2 (Match)

B = 2, F = 6

Difference = 6 – 2 = 4 (Match)

Option a, c and d follows the same logic except option (b).

Thus, the correct option is (b) C6J.