Refer to the following letter, number, symbol series and answer the question that follows.
(Left) K & 4 D π S Q 2 % M 6 ∞ R Z Ω β Y 7 @ 3 E (Right)
How many such numbers are there in the given series each of which is immediately preceded by a letter and also immediately followed by a symbol?
1
Three
2
One
3
Two
4
None