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Reasoning: Letter Series MCQ - Practice Questions with Answers

Solve 36 Reasoning: Letter Series questions for RAS/RPSC preparation.

Practice questions

Q1For the series AZ, BY, CX, DW, EV, which statement correctly describes the pattern?

A Both letters move one place forward in each term.
B The first letter moves two places forward and the second letter moves two places backward.
C The first letter moves one place forward and the second letter moves one place backward.
D The first letter remains fixed and the second letter moves one place backward.
Explanation

Read the two positions separately. The first letters are A, B, C, D, E, so they move one place forward each time. The second letters are Z, Y, X, W, V, so they move one place backward each time. Therefore the correct description is that the first letter moves one place forward and the second letter moves one place backward. No number or alternate jump is involved in this series.

Q2In the series AB2, CD4, EF6, GH8, which statement is correct about the next term?

A It is HI10.
B It is IJ9.
C It is KL10.
D It is IJ10.
Explanation

The letters are taken in consecutive non-overlapping pairs: AB, CD, EF, GH. Therefore the next pair must be IJ. The numbers are the even numbers 2, 4, 6, 8, so the next number is 10. Combining both parts, the next term is IJ10. Option D is correct. The other options either overlap the letters, skip the next pair, or break the number pattern.

Q3Read the assertion and reason for the series P3, R6, T9, V12. Assertion (A): The next term is X16. Reason (R): The letters increase by 2 positions and the numbers increase by 3.

A Both A and R are true, and R explains A.
B Both A and R are true, but R does not explain A.
C A is false, but R is true.
D A is true, but R is false.
Explanation

Check the two parts separately. The letters are P, R, T, V. Their positions increase by 2 each time, so after V the next letter is X. The numbers are 3, 6, 9, 12. They increase by 3 each time, so the next number is 15. Therefore the next term should be X15, not X16. The reason correctly states the pattern, but the assertion gives the wrong number. Hence A is false and R is true.

Q4Find the next term in the letter series: C, F, J, O, ?

A T
B U
C V
D R
Explanation

Write the alphabet positions: C = 3, F = 6, J = 10 and O = 15. The jumps are +3, +4 and +5. The pattern is that the jump increases by 1 each time. Therefore, the next jump should be +6. From O, which is the 15th letter, adding 6 gives the 21st letter. The 21st letter of the alphabet is U. Hence, the next term is U.

Q5Consider the series C1, F2, J4, O8, ?. Which statements are correct? I. The next letter is U. II. The next number is 16. III. The letter jumps are +2, +3, +4, +5.

A I only
B I and II only
C II and III only
D I, II and III
Explanation

Check the letter and number parts separately. The letters move as C to F (+3), F to J (+4), and J to O (+5). The next jump should be +6, so O becomes U. The numbers double each time: 1, 2, 4, 8, so the next number is 16. The statement about letter jumps being +2, +3, +4, +5 is false. The correct set is I and II only.

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More questions

6Match each series in List I with its next term in List II and choose the correct code. List I: I. A, D, G, J, ? II. B, E, I, N, ? III. ZA, XB, VC, TD, ? List II: 1. T 2. M 3. RE

AI-2, II-1, III-3
BI-1, II-2, III-3
CI-2, II-3, III-1
DI-3, II-1, III-2

7Match each series with its missing term. 1. A3, D6, G9, ? 2. MZ, OX, QV, ? 3. BA, DC, FE, ?

A1-J12, 2-ST, 3-HG
B1-I12, 2-ST, 3-HG
C1-J12, 2-SU, 3-HG
D1-J13, 2-ST, 3-HG

8In the series A1, C4, F9, J16, O25, what should come next?

AT36
BU36
CU49
DV49

9In the series Z3, W6, T9, Q12, N15, K18, which statement is incorrect?

AThe letters move 3 places backward each time.
BThe numbers increase by 3 each time.
CThe next term after K18 will be N21.
DThe term before Q12 is T9.

10Read the assertion and the reason for the series BDF, GIK, LNP, QSU. Assertion: The next term is VXY. Reason: To form the next term, each letter of a term is moved 5 positions forward in the alphabet.

AThe assertion is false, but the reason is true.
BBoth the assertion and the reason are true, and the reason explains the assertion.
CBoth the assertion and the reason are true, but the reason does not explain the assertion.
DThe assertion is true, but the reason is false.

11Which term is incorrect in the series: CF, FI, IL, LP, OR?

ACF
BFI
CIL
DLP

12Complete the letter series: DK, FN, HQ, JT, ?

ALW
BLV
CMW
DLX

13In the series M, P, T, Y, E, ?, which statement is correct?

AThe letters move ahead by a constant interval of 4.
BThe missing term is K.
CThe missing term is L.
DThe series starts moving backwards after Y.

14Consider the series Q2, T4, W8, Z16, ?. Assertion: The next term is C32. Reason: The letters move three places forward with wrap-around after Z, and the numbers are doubled each time. Choose the correct statement.

ABoth the assertion and the reason are true, but the reason does not explain the assertion.
BBoth the assertion and the reason are true, and the reason explains the assertion.
CThe assertion is true, but the reason is false.
DThe assertion is false, but the reason is true.

15Find the missing term in the series: C, F, J, O, U, ?

AA
BZ
CB
DY

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