Analyze Letter Symbol Series

The task is to find the number of letters in the given series that meet two specific conditions: they must be immediately preceded by another letter AND immediately followed by a symbol.

The series is: $@ L € F J £ E # N K # * R P * D # X T * G N$

Step-by-Step Analysis

We will examine each element from left to right, checking the conditions for letters only:

• $@ L$: 'L' is preceded by a symbol '@'. Condition not met.
• $€ F$: 'F' is preceded by a symbol '€'. Condition not met.
• $F J £$: 'J' is preceded by a letter 'F' and followed by a symbol '£'. Condition met. (Count = 1)
• $£ E #$: 'E' is preceded by a symbol '£'. Condition not met.
• $# N K #$: 'N' is preceded by a symbol '#'. Condition not met.
• $N K #$: 'K' is preceded by a letter 'N' and followed by a symbol '#'. Condition met. (Count = 2)
• $# * R$: 'R' is preceded by a symbol '*'. Condition not met.
• $R P *$: 'P' is preceded by a letter 'R' and followed by a symbol '*'. Condition met. (Count = 3)
• $* D #$: 'D' is preceded by a symbol '*'. Condition not met.
• $# X T$: 'X' is preceded by a symbol '#'. Condition not met.
• $X T *$: 'T' is preceded by a letter 'X' and followed by a symbol '*'. Condition met. (Count = 4)
• $* G N$: 'G' is preceded by a symbol '*'. Condition not met.
• $G N$: 'N' is preceded by a letter 'G' but is not followed by a symbol. Condition not met.

Final Count

By analyzing the series according to the given rules, we found 4 letters ('J', 'K', 'P', 'T') that satisfy both conditions.