Refer to the given letter and symbol series and answer the question that follows. 

K € T X @ * D X ¥ & J % Z Y S & # S & S F O G ^

How many such symbols are there in the series each of which is immediately preceded by a letter and also immediately followed by a letter?

Given series: K € T X @ * D X ¥ & J % Z Y S & # S & S F O G ^

Symbols which are there in the series each of which is immediately preceded by a letter and also immediately followed by a letter

Analyzing the series, we find the following symbols:

€ is preceded by 'K' and followed by 'T'.

% is preceded by 'J' and followed by 'Z'.

& is preceded by 'S' and followed by 'S'.

K € T X @ * D X ¥ & J % Z Y S & # S & S F O G ^

So, there are 3 such symbols.

Thus, correct option is (a).