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ReasoningMedium10 questions + 90 practice 55s per questionSSC CGLSSC CHSL

Letter & Semantic Series Quiz: Reasoning Practice

10 timed series questions. Letter gaps, alternating and alphanumeric series, repeating letter patterns, wrong-term spotting and logical word order.

Typographic composition in Eracom, Lausanne.
Photo: Romain Salomon, CC BY-SA 4.0, via Wikimedia Commons
Read the notes first (7 min)

Letter & Semantic Series Quiz: Reasoning Practice

  • 10 questions
  • Medium
  • 55s each

Tip: use keys 1-4 to answer, Enter for next.

Answers to the starter quiz

Spoilers! These are the Starter quiz’s answers. Easy, Medium, Hard and Mixed rounds show their own answers when you finish.

  1. Find the next letter: A, C, F, J, O, ?

    • T
    • U
    • V
    • S

    Answer: U. The gaps grow by one: +2, +3, +4, +5, so the next gap is +6. O is 15, and 15 + 6 = 21, which is U.

  2. Find the next term: BDF, GIK, LNP, ?

    • QSU
    • QRS
    • PRT
    • RTV

    Answer: QSU. Each group is three letters with a gap of 2, and each group starts 5 letters after the previous one: B(2), G(7), L(12), Q(17). Q + 2 = S, S + 2 = U.

  3. Find the next term: AZ, CX, EV, GT, ?

    • IS
    • HR
    • JQ
    • IR

    Answer: IR. The first letters move +2 (A, C, E, G, I) and the second letters move −2 (Z, X, V, T, R), giving IR.

  4. Find the next term: KM5, IP8, GS11, EV14, ?

    • CX17
    • DY17
    • CY17
    • CY18

    Answer: CY17. First letters go −2 (K, I, G, E, C), second letters +3 (M, P, S, V, Y) and the numbers +3 (5, 8, 11, 14, 17).

  5. Arrange in a logical sequence: 1. Seed 2. Flower 3. Tree 4. Fruit 5. Sapling

    • 1, 5, 3, 2, 4
    • 1, 3, 5, 2, 4
    • 5, 1, 3, 4, 2
    • 1, 5, 2, 3, 4

    Answer: 1, 5, 3, 2, 4. A seed grows into a sapling, the sapling into a tree, the tree flowers, and the flower develops into fruit.

  6. Arrange in a logical sequence: 1. Paragraph 2. Letter 3. Word 4. Sentence 5. Chapter

    • 3, 2, 4, 1, 5
    • 2, 3, 1, 4, 5
    • 2, 4, 3, 1, 5
    • 2, 3, 4, 1, 5

    Answer: 2, 3, 4, 1, 5. From smallest unit to largest: letter, word, sentence, paragraph, chapter.

  7. Arrange from shortest to longest: 1. Decade 2. Month 3. Century 4. Fortnight 5. Week

    • 4, 5, 2, 1, 3
    • 5, 4, 2, 1, 3
    • 5, 4, 1, 2, 3
    • 5, 2, 4, 1, 3

    Answer: 5, 4, 2, 1, 3. Week (7 days) < fortnight (14 days) < month < decade (10 years) < century (100 years).

  8. Which letters fill the blanks, in order? ab_da_cd_bcd

    • cab
    • bca
    • cba
    • abc

    Answer: cba. The block "abcd" repeats: ab(c)d a(b)cd (a)bcd. The blanks are c, b and a.

  9. Find the wrong term in the series: C, F, I, L, P, R

    • F
    • L
    • R
    • P

    Answer: P. The series moves +3: C(3), F(6), I(9), L(12), O(15), R(18). The fifth term should be O, so P is wrong.

  10. Which letter is 7th to the right of the 12th letter from the left of the English alphabet?

    • S
    • R
    • T
    • E

    Answer: S. The 12th letter is L. Seven places to its right is position 12 + 7 = 19, which is S.