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Number series: differences alternate between two fixed values (-4, -8, -4, -8 or +9, -5)

This type of question, asked 5 times: 14 Jul 2023 S2, 17 Jul 2023 S2, 17 Jul 2023 S3, 26 Sep 2024 S2, 12 Sep 2025 S1. All 6 questions below, oldest first.

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  1. Question 1

    14 Jul 2023 S2

    6
    Which of the following numbers will replace the question mark (?) in the given series? 33, 80, 108, ?, 183, 230, 258

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  2. Question 2

    17 Jul 2023 S2

    22
    Which of the following numbers will replace the question mark (?) in the given series? 43, 52, 47, ?, 51, 60, 55

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  3. Question 3

    17 Jul 2023 S2

    5
    Which number should replace the question mark (?) in the following number series? 512, 508, 500, 496, ?, 484

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  4. Question 4

    17 Jul 2023 S3

    18
    Which of the following numbers will replace the question mark (?) in the given series? 82, 79, 71, ?, 60, 57, 49

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  5. Question 5

    26 Sep 2024 S2

    20
    Select the number from among the given options that can replace the question mark (?) in the following series. 176,167,156,147,136, ?

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  6. Question 6

    12 Sep 2025 S1

    8
    What comes next: 3, 12, 7, 16, 11, 20, 15, ?

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