Q 7 D $ T 3 ! M ^ B 8 5 @ H 2 % A 9 * R 6 E S O 1 K & L # U 4 G ? P

How many such digits are there in the series which are immediately preceded by a letter and immediately followed by a symbol?

The correct option is Three.

To solve this problem, we need to find all instances in the given alphanumeric series that satisfy a specific condition.

Condition: A digit must be immediately preceded by a letter and immediately followed by a symbol.
In sequence order, the pattern to look for is: [Letter] -> [Digit] -> [Symbol].

Let us write out the given series carefully:

Q 7 D $ T 3 ! M ^ B 8 5 @ H 2 % A 9 * R 6 E S O 1 K & L # U 4 G ? P

Now, let us examine each digit in the series to see if it fits the required [Letter] -> [Digit] -> [Symbol] pattern:

1. Digit '7': Preceded by 'Q' (Letter), followed by 'D' (Letter). Does not match.
2. Digit '3': Preceded by 'T' (Letter), followed by '!' (Symbol). Match 1! (T 3 !)
3. Digit '8': Preceded by 'B' (Letter), followed by '5' (Digit). Does not match.
4. Digit '5': Preceded by '8' (Digit), followed by '@' (Symbol). Preceded by a digit, not a letter. Does not match.
5. Digit '2': Preceded by 'H' (Letter), followed by '%' (Symbol). Match 2! (H 2 %)
6. Digit '9': Preceded by 'A' (Letter), followed by '*' (Symbol). Match 3! (A 9 *)
7. Digit '6': Preceded by 'R' (Letter), followed by 'E' (Letter). Does not match.
8. Digit '1': Preceded by 'O' (Letter), followed by 'K' (Letter). Does not match.
9. Digit '4': Preceded by 'U' (Letter), followed by 'G' (Letter). Does not match.

Thus, there are exactly three such digits ('3', '2', and '9') that meet the criteria.