Look at this series: U32, V29, __, X23, Y20, ... What number should fill the blank?
Choose the correct choice from the following choices:
A) M43
B) D14
C) W26
D) F24
E) K81
W26   W26   In this series, the letters progress by 1; the numbers decrease by 3.
<result>C</result>
Look at this series: U32, V29, __, X23, Y20, ... What number should fill the blank?