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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Important Questions from Alpha-numeric series
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How many such pairs of letters are there in the word JOURNEY (in forward direction), each of which has as many letter in the same sequence between them in the word as in the English alphabet?
