1.  Choose the group of letters which is different from others.

A. DG2
B. EK5
C. JR6
D. PY8
E. RV3

Answer: Option C

Explanation:

:putting A = 1, B = 2, ......, Z = 26, we have : DG2 = G _ (D + 2) = 7 _ (4 + 2 ) = 1; EK5 = K _ (E + 5 ) = 11 _ (5 + 5) = 1; JR6 = R _ ( j + 6 ) = 18 _ (10 + 6) = 2; PY8 = Y _ ( P + 8 ) = 25 _ ( 16 + 8 ) = 1; RV3 = V _ ( R + 3 ) = 22 _ ( 18 + 3 ) = 1.