Find the missing term for the given series from the given alternatives:
$CMW, HRB, (?), RBL, WGQ, BLV$

Find out the missing letters for the given series from the given alternatives.
$adb.....ac.....da....cddcb.....dbc....cbda$

Find the missing letters for the given series from the given alternatives:
$.....bca......cca....ca.....b.....c$

The following question is based on the five three-digit numbers given:
$513, 248, 371, 634, 167$
Which of the following is the middle digit of the second highest number among these numbers?

Fill in the blank space for the given series with the correct alternative.
In the series $2, 6, 18, 54, \ldots,$ what will be the $8^{th}$ term?

Choose the correct alternative to complete the series: $b . . b . . b b . . . b b b . . . . b b . . b$