Refer to the following number and symbol series and answer the question that follows. Counting to be done from left to right only. All numbers are single-digit numbers.
(Left) 5 $ 5 % 8 7 * 5 % & 8 @ 2 6 2 £ 3 8 1 & 5 6 (Right)
How many such numbers are there each of which is immediately preceded by a number and also immediately followed by a number?​​

(Left) 5 $ 5 % 8 7 * 5 % & 8 @ 2 6 2 £ 3 8 1 & 5 6 (Right)

Logic: Number | Number | Number 

So, there are 2 such numbers, each of which is immediately preceded by a number and also immediately followed by a number.

Thus, correct option is (a).