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1 March, 08:51

Is 4,7,9,12 an arithmetic sequence?

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Answers (2)
  1. 1 March, 09:09
    0
    NO

    Step-by-step explanation:

    If a₁, a₂, a₃, a₄, a₅, ... make an arithmetic sequence, then

    aₙ - aₙ₋₁ = a₅ - a₄ = a₄ - a₃ = a₃ - a₂ = a₂ - a₁ = d (common difference)

    7 - 4 = 3

    9 - 7 = 2

    different differences
  2. 1 March, 10:43
    0
    No. The differences between two elements should be same. For example 4-7-10-13 is a arithmetic sequence.
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