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Logical Reasoning Test Practice Course：Number and letter series

不限时专题测验：关于Number and letter series的18道题，每道题作答后都有解释。每次题目和选项都会重新打乱。

  • 课程
  • 加拿大
  • 99道题
  • 核对于2026年10月13日
  • 事实核查：2026年10月13日
从课文开始Logical Reasoning Course: Lessons：阅读时间约180分钟。测试中的每道题在课文中都有讲解。

专题测验2：Number and letter series

  1. 第1题，共18题

    What number comes next in the series 4, 9, 14, 19, ?
    显示答案

    答案: D. 24

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

  2. 第2题，共18题

    What number comes next in the series 3, 6, 12, 24, ?
    显示答案

    答案: A. 48

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

  3. 第3题，共18题

    What number comes next in the series 81, 72, 63, 54, ?
    显示答案

    答案: D. 45

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

  4. 第4题，共18题

    What letter comes next in the series A, C, E, G, ?
    显示答案

    答案: 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. 第5题，共18题

    What number comes next in the series 1, 4, 9, 16, 25, ?
    显示答案

    答案: D. 36

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

  6. 第6题，共18题

    What letter comes next in the series Z, W, T, Q, ?
    显示答案

    答案: 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. 第7题，共18题

    What number comes next in the series 5, 7, 11, 17, 25, ?
    显示答案

    答案: D. 35

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

  8. 第8题，共18题

    What comes next in the series A1, C3, E5, G7, ?
    显示答案

    答案: 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. 第9题，共18题

    What number comes next in the series 2, 5, 11, 23, ?
    显示答案

    答案: A. 47

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

  10. 第10题，共18题

    What number comes next in the series 2, 3, 5, 8, 13, ?
    显示答案

    答案: D. 21

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

  11. 第11题，共18题

    What comes next in the series AZ, BY, CX, DW, ?
    显示答案

    答案: 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. 第12题，共18题

    What number comes next in the series 10, 3, 12, 6, 14, 9, ?
    显示答案

    答案: 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. 第13题，共18题

    What letter comes next in the series B, D, G, K, ?
    显示答案

    答案: 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. 第14题，共18题

    What number comes next in the series 100, 50, 52, 26, 28, ?
    显示答案

    答案: D. 14

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

  15. 第15题，共18题

    What number comes next in the series 1, 2, 6, 24, 120, ?
    显示答案

    答案: D. 720

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

  16. 第16题，共18题

    One number in this series is wrong: 2, 6, 18, 52, 162. Which one?
    显示答案

    答案: A. 52

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

  17. 第17题，共18题

    What letter comes next in the series D, F, I, M, R, ?
    显示答案

    答案: 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. 第18题，共18题

    What number comes next in the series 3, 4, 8, 17, 33, ?
    显示答案

    答案: C. 58

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

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