Which of the following letter pairs logically completes the given sequence? ZA, YC, XF, WJ… — State PSC Exam

Which of the following letter pairs logically completes the given sequence?

ZA, YC, XF, WJ, \dots

$VO$ Answer
B
$VN$
C
$UO$
D
$VP$

Answer

VO

The sequence consists of two independent letter patterns. The first letter decreases monotonically by 1 position (Z -> Y -> X -> W -> V). The second letter follows an increasing difference series (+2, +3, +4, +5), advancing J (10th position) to O (15th position). Combining these yields VO.

Step-by-Step Solution

Analyze the pattern of the first letter in each pair

Z (26), Y (25), X (24), W (23). The letters move backward by 1 step continuously. The next letter is V (22).

Determines the first letter of the missing term.

Analyze the pattern of the second letter in each pair

A (1) to C (3) is +2; C (3) to F (6) is +3; F (6) to J (10) is +4. The increment increases by 1 at each term. Adding 5 to J (10) gives 15, which corresponds to the letter O.

Determines the second letter of the missing term.

Combine both components to form the final term

Combining V and O gives VO.

Completes the sequence.

Key Concept

Dual-Pattern Alphabet Series with Positional Shifts

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