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Logical Reasoning Test Practice Course: Number and letter series

Quiz thématique sans limite de temps : 18 questions sur Number and letter series, avec une explication après chaque réponse. Les questions et les réponses sont mélangées à chaque fois.

  • Formation
  • Canada
  • 99 questions
  • Vérifié le 13 octobre 2026
  • Vérifié (faits) le 13 octobre 2026
Commencez par les leçonsLogical Reasoning Course: Lessons : environ 180 minutes de lecture. Chaque question du test est traitée dans les leçons.

Quiz thématique 2 : Number and letter series

  1. Question 1 sur 18

    What number comes next in the series 4, 9, 14, 19, ?
    Voir la réponse

    Réponse: D. 24

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

  2. Question 2 sur 18

    What number comes next in the series 3, 6, 12, 24, ?
    Voir la réponse

    Réponse: A. 48

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

  3. Question 3 sur 18

    What number comes next in the series 81, 72, 63, 54, ?
    Voir la réponse

    Réponse: D. 45

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

  4. Question 4 sur 18

    What letter comes next in the series A, C, E, G, ?
    Voir la réponse

    Réponse: 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. Question 5 sur 18

    What number comes next in the series 1, 4, 9, 16, 25, ?
    Voir la réponse

    Réponse: D. 36

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

  6. Question 6 sur 18

    What letter comes next in the series Z, W, T, Q, ?
    Voir la réponse

    Réponse: 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. Question 7 sur 18

    What number comes next in the series 5, 7, 11, 17, 25, ?
    Voir la réponse

    Réponse: D. 35

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

  8. Question 8 sur 18

    What comes next in the series A1, C3, E5, G7, ?
    Voir la réponse

    Réponse: 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. Question 9 sur 18

    What number comes next in the series 2, 5, 11, 23, ?
    Voir la réponse

    Réponse: A. 47

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

  10. Question 10 sur 18

    What number comes next in the series 2, 3, 5, 8, 13, ?
    Voir la réponse

    Réponse: D. 21

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

  11. Question 11 sur 18

    What comes next in the series AZ, BY, CX, DW, ?
    Voir la réponse

    Réponse: 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. Question 12 sur 18

    What number comes next in the series 10, 3, 12, 6, 14, 9, ?
    Voir la réponse

    Réponse: 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. Question 13 sur 18

    What letter comes next in the series B, D, G, K, ?
    Voir la réponse

    Réponse: 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. Question 14 sur 18

    What number comes next in the series 100, 50, 52, 26, 28, ?
    Voir la réponse

    Réponse: D. 14

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

  15. Question 15 sur 18

    What number comes next in the series 1, 2, 6, 24, 120, ?
    Voir la réponse

    Réponse: D. 720

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

  16. Question 16 sur 18

    One number in this series is wrong: 2, 6, 18, 52, 162. Which one?
    Voir la réponse

    Réponse: A. 52

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

  17. Question 17 sur 18

    What letter comes next in the series D, F, I, M, R, ?
    Voir la réponse

    Réponse: 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. Question 18 sur 18

    What number comes next in the series 3, 4, 8, 17, 33, ?
    Voir la réponse

    Réponse: C. 58

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

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