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Number series where each term = previous x a + b (fixed a, b): next or missing term

This type of question, asked 2 times: 26 Oct 2023 Tier II, 20 Jan 2025 Tier II. All 2 questions below, oldest first.

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  1. Question 1

    26 Oct 2023 Tier II

    33
    What should come in place of the question mark (?) in the given series? 18, 74, 298, 1194, 4778, ?

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  2. Question 2

    20 Jan 2025 Tier II

    58
    Select the number from among the given options that can replace the question mark (?) in the following series. 98, 50, 26, 14, ?, 5

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