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Logical Reasoning Test Practice Course: Number and letter series

Quiz tematico senza limite di tempo: 18 domande su Number and letter series, con una spiegazione dopo ogni risposta. Domande e risposte vengono mescolate ogni volta.

  • Corso
  • Canada
  • 99 domande
  • Verificato: 13 ottobre 2026
  • Verificato il 13 ottobre 2026
Inizia dalle lezioniLogical Reasoning Course: Lessons: circa 180 minuti di lettura. Ogni domanda del test è trattata nelle lezioni.

Quiz tematico 2: Number and letter series

  1. Domanda 1 di 18

    What number comes next in the series 4, 9, 14, 19, ?
    Mostra la risposta

    Risposta: D. 24

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

  2. Domanda 2 di 18

    What number comes next in the series 3, 6, 12, 24, ?
    Mostra la risposta

    Risposta: A. 48

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

  3. Domanda 3 di 18

    What number comes next in the series 81, 72, 63, 54, ?
    Mostra la risposta

    Risposta: D. 45

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

  4. Domanda 4 di 18

    What letter comes next in the series A, C, E, G, ?
    Mostra la risposta

    Risposta: 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. Domanda 5 di 18

    What number comes next in the series 1, 4, 9, 16, 25, ?
    Mostra la risposta

    Risposta: D. 36

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

  6. Domanda 6 di 18

    What letter comes next in the series Z, W, T, Q, ?
    Mostra la risposta

    Risposta: 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. Domanda 7 di 18

    What number comes next in the series 5, 7, 11, 17, 25, ?
    Mostra la risposta

    Risposta: D. 35

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

  8. Domanda 8 di 18

    What comes next in the series A1, C3, E5, G7, ?
    Mostra la risposta

    Risposta: 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. Domanda 9 di 18

    What number comes next in the series 2, 5, 11, 23, ?
    Mostra la risposta

    Risposta: A. 47

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

  10. Domanda 10 di 18

    What number comes next in the series 2, 3, 5, 8, 13, ?
    Mostra la risposta

    Risposta: D. 21

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

  11. Domanda 11 di 18

    What comes next in the series AZ, BY, CX, DW, ?
    Mostra la risposta

    Risposta: 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. Domanda 12 di 18

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

    Risposta: 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. Domanda 13 di 18

    What letter comes next in the series B, D, G, K, ?
    Mostra la risposta

    Risposta: 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. Domanda 14 di 18

    What number comes next in the series 100, 50, 52, 26, 28, ?
    Mostra la risposta

    Risposta: D. 14

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

  15. Domanda 15 di 18

    What number comes next in the series 1, 2, 6, 24, 120, ?
    Mostra la risposta

    Risposta: D. 720

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

  16. Domanda 16 di 18

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

    Risposta: A. 52

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

  17. Domanda 17 di 18

    What letter comes next in the series D, F, I, M, R, ?
    Mostra la risposta

    Risposta: 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. Domanda 18 di 18

    What number comes next in the series 3, 4, 8, 17, 33, ?
    Mostra la risposta

    Risposta: C. 58

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

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