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Number series: each term = previous x 2 (or x 3, or / 5) plus or minus a fixed number

This type of question, asked 17 times: 20 Jul 2023 S2, 20 Jul 2023 S3, 21 Jul 2023 S4, 11 Sep 2024 S3, 13 Sep 2024 S2, 15 Sep 2025 S2, 16 Sep 2025 S1, 16 Sep 2025 S2, 17 Sep 2025 S1, 17 Sep 2025 S3, 18 Sep 2025 S2, 19 Sep 2025 S1, 19 Sep 2025 S2, 21 Sep 2025 S1, 23 Sep 2025 S1, 23 Sep 2025 S2, 24 Sep 2025 S2. All 19 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    20 Jul 2023 S2

    5
    Which of the following numbers will replace the question mark (?) in the given series? 11, ?, 29, 53, 101, 197

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  2. Question 2

    20 Jul 2023 S3

    5
    Which number should replace the question mark (?) in the following number series? 5475, 1100, 225, 50, ?, 8, 6.6

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  3. Question 3

    21 Jul 2023 S4

    15
    Which number should replace the question mark (?) in the following number series? 32, 54, 98, 186, ?, 714

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  4. Question 4

    11 Sep 2024 S3

    20
    Which of the following numbers will replace the question mark (?) in the given series? 12, 25, 49, ?, 197, 395

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  5. Question 5

    13 Sep 2024 S2

    8
    What should come in place of the question mark (?) in the given series? 9 17 33 65 129 ?

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  6. Question 6

    15 Sep 2025 S2

    8
    Complete the pattern: 2, 6, 14, 30, 62, ?

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  7. Question 7

    16 Sep 2025 S1

    7
    What will come at the place of question mark? 1, 3, 7, 15, 31, ?

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  8. Question 8

    16 Sep 2025 S2

    8
    What will come at the place of question mark? 4, 10, 22, 46, 94, ?

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  9. Question 9

    17 Sep 2025 S1

    8
    What will come at the place of question mark? 5, 9, 17, 33, 65, ?

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  10. Question 10

    17 Sep 2025 S3

    24
    Find the next number in the series:3, 7, 15, 31, 63, ?

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  11. Question 11

    18 Sep 2025 S2

    23
    Find the next number in the series: 10, 21, 43, 87, ?, 351

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  12. Question 12

    19 Sep 2025 S1

    12
    What comes next: 2, 3, 5, 9, 17, 33, ?

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  13. Question 13

    19 Sep 2025 S1

    24
    Find the next number in the series : 2, 5, 11, 23, 47, ?

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  14. Question 14

    19 Sep 2025 S2

    7
    Complete the pattern: 1, 4, 13, 40, 121, ?

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  15. Question 15

    21 Sep 2025 S1

    23
    What should come at the place of question mark? 2, 5, 11, 23, 47, ?

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  16. Question 16

    23 Sep 2025 S1

    14
    What should come at the place of question mark? : 4, 9, 19, 39, 79, ?

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  17. Question 17

    23 Sep 2025 S2

    18
    Complete the series. 5, 11, 23, 47, ?

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  18. Question 18

    23 Sep 2025 S2

    20
    What should come at the place of question mark? : 31, 63, 127, 255, 511, ?

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  19. Question 19

    24 Sep 2025 S2

    14
    Complete the series. 2, 3, 5, 9, 17, ___

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