← General Intelligence and Reasoning

Letter Series — Questions with Solutions

18 solved Letter Series questions from General Intelligence and Reasoning, as asked in SSC CGL and other SSC exams. Read the answer and explanation below, then practise the full set in the practice section.

Practise this topic

Q1. Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. BDHJ, CEIK, DFJL, EGKM, ?

उस अक्षर-समूह का चयन करें जो प्रश्नवाचक चिह्न (?) को प्रतिस्थापित कर सकता है: BDHJ, CEIK, DFJL, EGKM, ?

  1. A. FHLN
  2. B. GJMN
  3. C. FILO
  4. D. GJNO

Solution

Each corresponding letter increases by 1. E(+1)=F, G(+1)=H, K(+1)=L, M(+1)=N.

Q2. Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. XZYX, XYXX, XXWX, XWVX, ?

उस अक्षर-समूह का चयन करें जो निम्नलिखित श्रृंखला में प्रश्नवाचक चिह्न (?) को प्रतिस्थापित कर सकता है: XZYX, XYXX, XXWX, XWVX, ?

  1. A. XVUX
  2. B. XTVX
  3. C. XUVX
  4. D. XUTX

Solution

1st and 4th letters are constant 'X'. 2nd letter decreases by 1 (Z, Y, X, W, V). 3rd letter decreases by 1 (Y, X, W, V, U). Result: XVUX.

Q3. Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. ACE, DFH, GIK, JLN, ?

उस अक्षर-समूह का चयन करें जो प्रश्नवाचक चिह्न (?) को प्रतिस्थापित कर सकता है: ACE, DFH, GIK, JLN, ?

  1. A. NOM
  2. B. LMN
  3. C. MOQ
  4. D. OPQ

Solution

Each letter in the cluster increases by 3. J(+3)=M, L(+3)=O, N(+3)=Q. Result is MOQ.

Q4. Select the letter-cluster that will replace the question mark (?). CHI, FKL, INO, LQR, ?

(?) को प्रतिस्थापित करने वाला अक्षर-समूह चुनें। CHI, FKL, INO, LQR, ?

  1. A. OSU
  2. B. OTU
  3. C. PRU
  4. D. PSV

Solution

Pattern +3. L(+3)=O, Q(+3)=T, R(+3)=U. OTU.

Q5. Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. EHF, JKM, ONT, ?

उस अक्षर-समूह का चयन करें जो निम्नलिखित श्रृंखला में प्रश्नवाचक चिह्न (?) को प्रतिस्थापित कर सकता है: EHF, JKM, ONT, ?

  1. A. TUV
  2. B. STU
  3. C. TQA
  4. D. QAT

Solution

1st letter: E(+5)=J(+5)=O(+5)=T. 2nd letter: H(+3)=K(+3)=N(+3)=Q. 3rd letter: F(+7)=M(+7)=T(+7)=A. Result is TQA.

Q6. Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. BDH, EJM, IPR, ?

उस अक्षर-समूह का चयन करें जो निम्नलिखित श्रृंखला में प्रश्नवाचक चिह्न (?) को प्रतिस्थापित कर सकता है: BDH, EJM, IPR, ?

  1. A. NVW
  2. B. MUX
  3. C. NVX
  4. D. MVW

Solution

1st letter: B(+3)=E(+4)=I(+5)=N. 2nd letter: D(+6)=J(+6)=P(+6)=V. 3rd letter: H(+5)=M(+5)=R(+5)=W. Result: NVW.

Q7. Select the letter-cluster that will replace the question mark. BCF, GHK, LMP, ?

उस अक्षर-समूह का चयन करें जो प्रश्नवाचक चिह्न को प्रतिस्थापित करेगा: BCF, GHK, LMP, ?

  1. A. QSU
  2. B. QRV
  3. C. RRU
  4. D. QRU

Solution

Pattern is +5 for each corresponding letter. B(+5)=G(+5)=L(+5)=Q. C(+5)=H(+5)=M(+5)=R. F(+5)=K(+5)=P(+5)=U. Result is QRU.

Q8. Select the letter-cluster that will replace the question mark. ACE, BDF, CEG, ?

उस अक्षर-समूह का चयन करें जो प्रश्नवाचक चिह्न को प्रतिस्थापित करेगा: ACE, BDF, CEG, ?

  1. A. BFH
  2. B. DFI
  3. C. DFH
  4. D. EGI

Solution

Pattern: +1 to each letter from the previous term. A(+1)=B(+1)=C(+1)=D. C(+1)=D(+1)=E(+1)=F. E(+1)=F(+1)=G(+1)=H. Result is DFH.

Q9. Select the letter-cluster that will replace the question mark. RST, UVW, XYZ, ?

उस अक्षर-समूह का चयन करें जो प्रश्नवाचक चिह्न को प्रतिस्थापित करेगा: RST, UVW, XYZ, ?

  1. A. ABC
  2. B. BCD
  3. C. YZA
  4. D. DEF

Solution

The series consists of consecutive blocks of 3 letters from the alphabet. After XYZ, it wraps around to ABC.

Q10. Select the letter-cluster that will replace the question mark. BDF, CEG, DFH, ?

उस अक्षर-समूह का चयन करें जो प्रश्नवाचक चिह्न को प्रतिस्थापित करेगा: BDF, CEG, DFH, ?

  1. A. EGI
  2. B. EHK
  3. C. EJL
  4. D. FGK

Solution

Pattern is +1 to each letter from the previous group. B(+1)=C(+1)=D(+1)=E. D(+1)=E(+1)=F(+1)=G. F(+1)=G(+1)=H(+1)=I. Result is EGI.

Q11. Select the letter-cluster that will replace the question mark. JKL, MNO, PQR, ?

उस अक्षर-समूह का चयन करें जो प्रश्नवाचक चिह्न को प्रतिस्थापित करेगा: JKL, MNO, PQR, ?

  1. A. QRS
  2. B. STU
  3. C. UVW
  4. D. TUV

Solution

The series is just consecutive blocks of three letters from the alphabet: JKL, MNO, PQR, STU.

Q12. Select the letter-cluster that will replace the question mark. BCF, GHK, LMP, ?

उस अक्षर-समूह का चयन करें जो प्रश्नवाचक चिह्न को प्रतिस्थापित करेगा: BCF, GHK, LMP, ?

  1. A. QSU
  2. B. QRV
  3. C. RRU
  4. D. QRU

Solution

Pattern is +5 for each corresponding letter. B(+5)=G(+5)=L(+5)=Q. C(+5)=H(+5)=M(+5)=R. F(+5)=K(+5)=P(+5)=U. Result is QRU.

Q13. Select the letter-cluster that will replace the question mark. ACE, BDF, CEG, ?

उस अक्षर-समूह का चयन करें जो प्रश्नवाचक चिह्न को प्रतिस्थापित करेगा: ACE, BDF, CEG, ?

  1. A. BFH
  2. B. DFI
  3. C. DFH
  4. D. EGI

Solution

Pattern: +1 to each letter from the previous term. A(+1)=B(+1)=C(+1)=D. C(+1)=D(+1)=E(+1)=F. E(+1)=F(+1)=G(+1)=H. Result is DFH.

Q14. Select the letter-cluster that will replace the question mark. RST, UVW, XYZ, ?

उस अक्षर-समूह का चयन करें जो प्रश्नवाचक चिह्न को प्रतिस्थापित करेगा: RST, UVW, XYZ, ?

  1. A. ABC
  2. B. BCD
  3. C. YZA
  4. D. DEF

Solution

The series consists of consecutive blocks of 3 letters from the alphabet. After XYZ, it wraps around to ABC.

Q15. Select the letter-cluster that will replace the question mark. BDF, CEG, DFH, ?

उस अक्षर-समूह का चयन करें जो प्रश्नवाचक चिह्न को प्रतिस्थापित करेगा: BDF, CEG, DFH, ?

  1. A. EGI
  2. B. EHK
  3. C. EJL
  4. D. FGK

Solution

Pattern is +1 to each letter from the previous group. B(+1)=C(+1)=D(+1)=E. D(+1)=E(+1)=F(+1)=G. F(+1)=G(+1)=H(+1)=I. Result is EGI.

Q16. Select the letter-cluster that will replace the question mark. JKL, MNO, PQR, ?

उस अक्षर-समूह का चयन करें जो प्रश्नवाचक चिह्न को प्रतिस्थापित करेगा: JKL, MNO, PQR, ?

  1. A. QRS
  2. B. STU
  3. C. UVW
  4. D. TUV

Solution

The series is just consecutive blocks of three letters from the alphabet: JKL, MNO, PQR, STU.

Q17. Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. CFG, EHI, GJK, ILM, ?

निम्नलिखित श्रृंखला में प्रश्नवाचक चिह्न (?) को प्रतिस्थापित करने वाले अक्षर-समूह का चयन करें। CFG, EHI, GJK, ILM, ?

  1. A. KNO
  2. B. JMN
  3. C. JMO
  4. D. KMN

Solution

The pattern is +2 for each letter: C(+2)=E, F(+2)=H, G(+2)=I. Following this for ILM: I(+2)=K, L(+2)=N, M(+2)=O. Thus, KNO.

Q18. Which of the following letter-clusters will replace the question mark (?) in the given series? PK, GT, XC, OL, ?

निम्नलिखित में से कौन सा अक्षर-समूह दी गई श्रृंखला में प्रश्नवाचक चिह्न (?) को प्रतिस्थापित करेगा? PK, GT, XC, OL, ?

  1. A. GT
  2. B. HS
  3. C. EV
  4. D. FU

Solution

The first letter decreases by 9 positions: P(-9) -> G, G(-9) -> X, X(-9) -> O, O(-9) -> F. The second letter increases by 9 positions: K(+9) -> T, T(+9) -> C, C(+9) -> L, L(+9) -> U. Thus, FU.