Refer to the following letter, number, symbol series and answer the question that follows.
(Left) R Y # 5 E Ω D 2 @ 6 K 4 G & T 3 S C % 7 M (Right)
As per the given series, three of the following four are alike in a certain way and hence form a group. Which of the following does NOT belong to that group?
1
K&6
2
E25
3
SM3
4
TC&