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Number series: two-level differences (the differences of the differences grow by a fixed step)

This type of question, asked 4 times: 24 Jul 2023 S4, 13 Sep 2024 S1, 14 Sep 2025 S2, 18 Sep 2025 S3. All 4 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    24 Jul 2023 S4

    20
    Select the number from among the given options that can replace the question mark (?) in the following series. 31, 37, 46, 60, 81, ?

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  2. Question 2

    13 Sep 2024 S1

    4
    Select the number from among the given options that can replace the question mark (?) in the following series. 30, 20, ?, 60, 140

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  3. Question 3

    14 Sep 2025 S2

    4
    What comes next? 3, 8, 18, 35, 61, ?

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  4. Question 4

    18 Sep 2025 S3

    6
    What comes next: 13, 16, 21, 30, 45, ?

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