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Study the following series $I$ and $II$ comprising letters/digits/symbols and answer the questions given below

What is the total number of symbols in Series $I$ each of which is immediately followed by a digit and immediately preceded by a letter together with the number of letters in series $II$ which are immediately preceded by a symbol and immediately followed by a letter?

1. $5$
2. $4$
3. $1$
4. $3$

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