Find the number that fits somewhere into the middle of the series. Some of the items involve both numbers and letters
Look at this series: J14, L16, __, P20, R22, ... What number should fill the blank?  Pick one.
A) S16 B) B29 C) N18 D) T34 E) M45
N18   N18   In this series, the letters progress by 2, and the numbers increase by 2.
<result>C</result>
Find the number that fits somewhere into the middle of the series. Some of the items involve both numbers and letters
Look at this series: J14, L16, __, P20, R22, ... What number should fill the blank?