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Falling series: subtract consecutive odd numbers that grow by 2 (-7, -9, -11, ...)

The same question, asked 2 times: 17 Jul 2023 S3*, 18 Jul 2023 S1. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    17 Jul 2023 S3

    5
    Select the number from among the given options that can replace the question mark (?) in the following series. 80, 73, 64, 53, 40, ?

    Tap an option to check your answer.

  2. Question 2

    18 Jul 2023 S1

    7
    Which of the following numbers will replace the question mark (?) in the given series? 108, 99, 88, ? , 60, 43

    Tap an option to check your answer.