Refer to the following letter and symbol series and answer the question that follows. Counting is to be done from left to right only. L P ? @ N F & ? @ Z Y N D C R T Z B = ? Q How many such letters are there, each of which is immediately preceded by a symbol and also immediately followed by a letter?

Refer to the following series of numbers and symbols (counting from left to right only; all numbers are single-digit numbers): (Left) ^ @ / > 5 1 3 2 6 * % 8 5 5 7 * # $ ^ # ? (Right) How many such symbols are there, each of which is immediately preceded by a number and also immediately followed by a number?

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 only. (Left) 2 8 3 @ & / > 9 8 \ $ 8 > 5 * ^ 9 4 2 5 ^ (Right) How many such symbols are there, each of which is immediately preceded by a number and also immediately followed by a number?