Select the option that can replace the question mark (?) in the following series. AH21, CJ18, EL15, GN12, ?
IP9
To find the pattern of the given sequence, the relationship between the letters and numbers is explained below.
Alphabet Pattern:
First letter: $\text{A} \xrightarrow{+2} \text{C} \xrightarrow{+2} \text{E} \xrightarrow{+2} \text{G} \xrightarrow{+2} \text{\textbf{I}}$
Second letter: $\text{H} \xrightarrow{+2} \text{J} \xrightarrow{+2} \text{L} \xrightarrow{+2} \text{N} \xrightarrow{+2} \text{\textbf{P}}$
Number Pattern:
The numbers are decreasing by $3$ in each term: $21 \xrightarrow{-3} 18 \xrightarrow{-3} 15 \xrightarrow{-3} 12 \xrightarrow{-3} \text{\textbf{9}}$
Combining both patterns gives us the next term.
Answer: IP9
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What should come in place of the question mark (?) in the given series based on the English alphabetical order?
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