Question

In the following question, a letter-number series is given with one term missing as shown by question mark (?). Choose the missing term out of the given alternatives.
W-144, ?, S-100, Q-81, O-64}

• A. U-121
• B. U-122
• C. V-121
• D. V-128

Hint:

Check both \textbf{letter patterns} and \textbf{number patterns} separately in mixed series.

Answer 1

The Correct Option is A

Concept: This series involves:

• Alphabet positions decreasing
• Perfect squares decreasing

Step 1:Analyze letters: \[ W, ?, S, Q, O \] Positions: \[ W(23), ?, S(19), Q(17), O(15) \] Pattern: \[ -2 \text{ each step} \Rightarrow W(23), U(21), S(19), Q(17), O(15) \] So missing letter = U
Step 2:Analyze numbers: \[ 144, ?, 100, 81, 64 \] These are: \[ 12^2, 11^2, 10^2, 9^2, 8^2 \] So missing number = \[ 11^2 = 121 \]
Step 3:Combine: \[ \text{U-121} \]
Step 4:Final Answer: \[ \text{U-121} \]