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Letter and Symbol Series
1.SCD, TEF, UGH, ____, WKL

Explanation:

Solution:
There are two alphabetical series here. The first series is with the first letters only: STUVW. The second series involves the remaining letters: CD, EF, GH, IJ, KL.

2.B2CD, _____, BCD4, B5CD, BC6D

Explanation:

Solution:
Because the letters are the same, concentrate on the number series, which is a simple 2, 3, 4, 5, 6 series, and follows each letter in order.

3.FAG, GAF, HAI, IAH, ____

Explanation:

Solution:
The middle letters are static, so concentrate on the first and third letters. The series involves an alphabetical order with a reversal of the letters. The first letters are in alphabetical order: F, G, H, I , J. The second and fourth segments are reversals of the first and third segments. The missing segment begins with a new letter.

4.CMM, EOO, GQQ, _____, KUU

Explanation:

Solution:
The first letters are in alphabetical order with a letter skipped in between each segment: C, E, G, I, K. The second and third letters are repeated; they are also in order with a skipped letter: M, O, Q, S, U.

5.ZA5, Y4B, XC6, W3D, _____

Explanation:

Solution:
There are three series to look for here. The first letters are alphabetical in reverse: Z, Y, X, W, V. The second letters are in alphabetical order, beginning with A. The number series is as follows: 5, 4, 6, 3, 7.

6.QPO, NML, KJI, _____, EDC

Explanation:

Solution:
This series consists of letters in a reverse alphabetical order.

7.JAK, KBL, LCM, MDN, _____

Explanation:

Solution:
This is an alternating series in alphabetical order. The middle letters follow the order ABCDE. The first and third letters are alphabetical beginning with J. The third letter is repeated as a first letter in each subsequent three-letter segment.

8.P5QR, P4QS, P3QT, _____, P1QV

Explanation:

Solution:
The first two letters, PQ, are static. The third letter is in alphabetical order, beginning with R. The number series is in descending order beginning with 5.

9.QAR, RAS, SAT, TAU, _____

Explanation:

Solution:
In this series, the third letter is repeated as the first letter of the next segment. The middle letter, A, remains static. The third letters are in alphabetical order, beginning with R.

10.DEF, DEF2, DE2F2, _____, D2E2F3