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Logical Reasoning Test Practice Course: Number and letter series

Themaquiz zonder tijdslimiet: 18 vragen over Number and letter series, met een uitleg na elk antwoord. Vragen en antwoorden worden elke keer gehusseld.

  • Cursus
  • Canada
  • 99 vragen
  • Gecontroleerd op 13 oktober 2026
  • Feiten gecontroleerd op 13 oktober 2026
Begin met de lessenLogical Reasoning Course: Lessons: ongeveer 180 minuten leestijd. Elke testvraag wordt in de lessen behandeld.

Themaquiz 2: Number and letter series

  1. Vraag 1 van 18

    What number comes next in the series 4, 9, 14, 19, ?
    Toon antwoord

    Antwoord: D. 24

    Each number is 5 more than the one before: 19 + 5 = 24.

  2. Vraag 2 van 18

    What number comes next in the series 3, 6, 12, 24, ?
    Toon antwoord

    Antwoord: A. 48

    Each number is double the one before: 24 × 2 = 48.

  3. Vraag 3 van 18

    What number comes next in the series 81, 72, 63, 54, ?
    Toon antwoord

    Antwoord: D. 45

    Each number is 9 less than the one before: 54 − 9 = 45.

  4. Vraag 4 van 18

    What letter comes next in the series A, C, E, G, ?
    Toon antwoord

    Antwoord: D. I

    The letters skip one each time: A(1), C(3), E(5), G(7), so next is position 9, which is I.

  5. Vraag 5 van 18

    What number comes next in the series 1, 4, 9, 16, 25, ?
    Toon antwoord

    Antwoord: D. 36

    These are square numbers: 1×1, 2×2, 3×3, 4×4, 5×5. Next is 6 × 6 = 36.

  6. Vraag 6 van 18

    What letter comes next in the series Z, W, T, Q, ?
    Toon antwoord

    Antwoord: A. N

    The letters go back 3 each time: Z(26), W(23), T(20), Q(17), so next is 14, which is N.

  7. Vraag 7 van 18

    What number comes next in the series 5, 7, 11, 17, 25, ?
    Toon antwoord

    Antwoord: D. 35

    The differences are 2, 4, 6, 8, so the next difference is 10: 25 + 10 = 35.

  8. Vraag 8 van 18

    What comes next in the series A1, C3, E5, G7, ?
    Toon antwoord

    Antwoord: A. I9

    Each letter skips one, and the number is the letter's position in the alphabet: I is the 9th letter, so I9.

  9. Vraag 9 van 18

    What number comes next in the series 2, 5, 11, 23, ?
    Toon antwoord

    Antwoord: A. 47

    Each number is doubled and then 1 is added: 23 × 2 + 1 = 47.

  10. Vraag 10 van 18

    What number comes next in the series 2, 3, 5, 8, 13, ?
    Toon antwoord

    Antwoord: D. 21

    Each number is the sum of the two before it: 5 + 8 = 13, so 8 + 13 = 21.

  11. Vraag 11 van 18

    What comes next in the series AZ, BY, CX, DW, ?
    Toon antwoord

    Antwoord: A. EV

    The first letter moves forward one place (A, B, C, D, E) and the second moves back one place (Z, Y, X, W, V).

  12. Vraag 12 van 18

    What number comes next in the series 10, 3, 12, 6, 14, 9, ?
    Toon antwoord

    Antwoord: C. 16

    Two series alternate: 10, 12, 14 (add 2) and 3, 6, 9 (add 3). The next number belongs to the first series: 14 + 2 = 16.

  13. Vraag 13 van 18

    What letter comes next in the series B, D, G, K, ?
    Toon antwoord

    Antwoord: A. P

    The gaps grow: +2, +3, +4, so the next gap is +5. K is 11, and 11 + 5 = 16, which is P.

  14. Vraag 14 van 18

    What number comes next in the series 100, 50, 52, 26, 28, ?
    Toon antwoord

    Antwoord: D. 14

    The steps alternate: divide by 2, then add 2. After 28 comes 28 ÷ 2 = 14.

  15. Vraag 15 van 18

    What number comes next in the series 1, 2, 6, 24, 120, ?
    Toon antwoord

    Antwoord: D. 720

    Multiply by 2, then 3, then 4, then 5. The next step is × 6: 120 × 6 = 720.

  16. Vraag 16 van 18

    One number in this series is wrong: 2, 6, 18, 52, 162. Which one?
    Toon antwoord

    Antwoord: A. 52

    Each number should be 3 times the one before: 2, 6, 18, 54, 162. So 52 should be 54.

  17. Vraag 17 van 18

    What letter comes next in the series D, F, I, M, R, ?
    Toon antwoord

    Antwoord: A. X

    The gaps are +2, +3, +4, +5, so the next gap is +6. R is 18, and 18 + 6 = 24, which is X.

  18. Vraag 18 van 18

    What number comes next in the series 3, 4, 8, 17, 33, ?
    Toon antwoord

    Antwoord: C. 58

    The differences are 1, 4, 9, 16 (square numbers). The next difference is 25: 33 + 25 = 58.

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