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Which of the following options should come in place of the question mark (?) in the given series to make it logically complete? HN18, KQ27, NT36, QW45,?
TZ55
TZ54
SY54
SY55
TZ54
Split the term into three parts: first letter (+3), second letter (+3), and number (+9). Follow the pattern consistently for all three components.
Split the term into three parts: first letter (+3), second letter (+3), and number (+9). Follow the pattern consistently for all three components.
Analyze the first letter
H (8) + 3 = K (11); K (11) + 3 = N (14); N (14) + 3 = Q (17); Q (17) + 3 = T (20). The first letter of the missing term is T.
Analyze the second letter
N (14) + 3 = Q (17); Q (17) + 3 = T (20); T (20) + 3 = W (23); W (23) + 3 = Z (26). The second letter of the missing term is Z.
Analyze the number
18 + 9 = 27; 27 + 9 = 36; 36 + 9 = 45; 45 + 9 = 54. The number of the missing term is 54.
A is wrong because it ends in 55 instead of 54. C is wrong because it starts with SY instead of TZ. D is wrong because it starts with SY instead of TZ.
B is correct because the series follows the pattern of adding 3 to both letters and adding 9 to the numeric value, resulting in TZ54.
In alphanumeric series, always process letters and numbers separately to avoid confusion. If you see a multi-part term, treat each part as its own small series.
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