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Logical Reasoning Test Practice Course: Number and letter series

Themenquiz ohne Zeitlimit: 18 Fragen zu Number and letter series, mit einer Erklärung nach jeder Antwort. Fragen und Antworten werden jedes Mal neu gemischt.

  • Kurs
  • Kanada
  • 99 Fragen
  • Geprüft am 13. Oktober 2026
  • Faktengeprüft am 13. Oktober 2026
Beginnen Sie mit den LektionenLogical Reasoning Course: Lessons: etwa 180 Minuten Lesezeit. Jede Testfrage wird in den Lektionen behandelt.

Themenquiz 2: Number and letter series

  1. Frage 1 von 18

    What number comes next in the series 4, 9, 14, 19, ?
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    Antwort: D. 24

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

  2. Frage 2 von 18

    What number comes next in the series 3, 6, 12, 24, ?
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    Antwort: A. 48

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

  3. Frage 3 von 18

    What number comes next in the series 81, 72, 63, 54, ?
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    Antwort: D. 45

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

  4. Frage 4 von 18

    What letter comes next in the series A, C, E, G, ?
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    Antwort: 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. Frage 5 von 18

    What number comes next in the series 1, 4, 9, 16, 25, ?
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    Antwort: D. 36

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

  6. Frage 6 von 18

    What letter comes next in the series Z, W, T, Q, ?
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    Antwort: 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. Frage 7 von 18

    What number comes next in the series 5, 7, 11, 17, 25, ?
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    Antwort: D. 35

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

  8. Frage 8 von 18

    What comes next in the series A1, C3, E5, G7, ?
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    Antwort: 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. Frage 9 von 18

    What number comes next in the series 2, 5, 11, 23, ?
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    Antwort: A. 47

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

  10. Frage 10 von 18

    What number comes next in the series 2, 3, 5, 8, 13, ?
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    Antwort: D. 21

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

  11. Frage 11 von 18

    What comes next in the series AZ, BY, CX, DW, ?
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    Antwort: 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. Frage 12 von 18

    What number comes next in the series 10, 3, 12, 6, 14, 9, ?
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    Antwort: 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. Frage 13 von 18

    What letter comes next in the series B, D, G, K, ?
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    Antwort: 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. Frage 14 von 18

    What number comes next in the series 100, 50, 52, 26, 28, ?
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    Antwort: D. 14

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

  15. Frage 15 von 18

    What number comes next in the series 1, 2, 6, 24, 120, ?
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    Antwort: D. 720

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

  16. Frage 16 von 18

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

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

  17. Frage 17 von 18

    What letter comes next in the series D, F, I, M, R, ?
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    Antwort: 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. Frage 18 von 18

    What number comes next in the series 3, 4, 8, 17, 33, ?
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    Antwort: C. 58

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

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