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Complete the series: B2, D4, F6, H8, ?
J10
I9
J12
K10
J10
Observe the two independent sub-series: letters follow consecutive alphabetical order +2, while numbers follow consecutive even integers.
Observe the two independent sub-series: letters follow consecutive alphabetical order +2, while numbers follow consecutive even integers.
Analyze the letter pattern
The first characters are B, D, F, H. Mapping their positions: B=2, D=4, F=6, H=8. Each letter increases by 2 positions in the alphabet. Therefore, the next letter position is 8 + 2 = 10, which corresponds to the 10th letter, J.
Analyze the number pattern
The second characters are 2, 4, 6, 8. This is a sequence of consecutive even integers increasing by 2. The next number is 8 + 2 = 10.
Combine the results
Combining the letter J and the number 10, we get the next term in the series as J10.
B: I9 is incorrect because it uses the 9th letter (I) and an odd number, violating the +2 pattern. C: J12 is incorrect because while J is correct, 12 follows an incorrect +4 increment instead of the established +2. D: K10 is incorrect because K is the 11th letter, which breaks the +2 alphabetical sequence.
A is correct because the series follows a consistent pattern of increasing the alphabet index by 2 and the numerical value by 2 for each subsequent term.
In alphanumeric series, always split the terms into two separate parallel series (letters and numbers) to simplify the analysis.
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