Complete the series: W-144, U-121, S-100, Q-81, ?

The correct answer is Option (1) → O-64

For alphabets, next alphabet is 1 less in descending order, thus alphabet is O. For number in descending order: \( {12}^{2} \) , \( {11}^{2} \) , \( {10}^{2} \) , \( {9}^{2} \) , \( {8}^{2} \)

Thus answer is O-64