Correct Answer - Option 4 : Three

Given series:

Left Side A $ 3 4 U X % Y 3 # 4 5 B 6 @ 7 9 E © 3 9 Z ! 8 2 1 ¥ 3 Right Side

1) Symbols which are immediately preceded and followed by a number:

A $ 3 4 U X % Y **3 # 4** 5 B **6 @ 7** 9 E © 3 9 Z ! 8 2 **1 ¥ 3**

Hence, there are 3 symbols which is immediately preceded by number and followed by an alphabet:

__3 # 4__,

__6 @ 7__ and

__1 ¥ 3.__