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23 September, 02:59

Which formula can be used to find the nth term in a geometric sequence where a1=3 and r=2?

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Answers (2)
  1. 23 September, 04:56
    0
    1st term = a₁ = 3, r=2

    1st a₁ = 3 x 2⁰

    2nd a₂ = 3 x 2¹

    3rd a₃ = 3 x 2²

    4th a₄ = 3 x 2³

    5th a₅ = 3 x 2⁴

    ...

    ...

    nth : a (n) = 3 x 2 (ⁿ-¹)

    Note when that the subscript of a is the same as the exponent mines 1
  2. 23 September, 05:59
    0
    A (n) = a (1) * r^ (n-1)

    a (n) = 3*2^ (n-1)

    Hope I don't mess up for your sake.
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