Study the following alphanumeric symbol series carefully and answer the questions given below:
F 4 A % T 9 µ Z M 3 N # L & E 2 X C 7 G D * O 5 R ∞ H 1 J $ @ K 8 B

What is the sum of the digits which are 3rd from the left end and 4th from the right end?

The correct option is 10.

To find the required sum, let us analyze the given alphanumeric symbol series:
F 4 A % T 9 µ Z M 3 N # L & E 2 X C 7 G D * O 5 R ∞ H 1 J $ @ K 8 B

First, let us identify and list all the digits present in the series from left to right:
4, 9, 3, 2, 7, 5, 1, 8

Now, let us locate the specific digits as required by the question:

1. Digit which is 3rd from the left end:
Scanning the digits from the left end:
- 1st digit from left is 4
- 2nd digit from left is 9
- 3rd digit from left is 3
So, the 3rd digit from the left end is 3.

2. Digit which is 4th from the right end:
Scanning the digits from the right end:
- 1st digit from right is 8
- 2nd digit from right is 1
- 3rd digit from right is 5
- 4th digit from right is 7
So, the 4th digit from the right end is 7.

Finally, we calculate the sum of these two digits:
$Sum\; =\; 3\; +\; 7\; =\; 10$

Thus, the sum of the digits is 10.