Study the following digit-letter-symbol series carefully and answer the question that follows.

Np4@8cQ9%6TkF3=5g4&RwJX

How many such numbers are there in the sequence, each of which is immediately preceded by a letter and immediately followed by a symbol?

Digit-letter-symbol series - Np4@8cQ9%6TkF3=5g4&RwJX

Logic:  Letter | Number | Symbol​

We're looking for numbers that are immediately preceded by a letter and immediately followed by a symbol. 

N p4@ 8c Q9% 6Tk F3= 5 g4& RwJX

4 (preceded by 'p' and followed by '@')

9 (preceded by 'Q' and followed by '%')

3 (preceded by 'F' and followed by '=')

4 (preceded by 'g' and followed by '&') 

So, there are 4 such numbers in the sequence that are each immediately preceded by a letter and immediately followed by a symbol.

Thus, correct answer is (a) 4