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3 December, 22:25

Find the nTH term of this sequence: 15, 12, 9, 6

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Answers (2)
  1. 3 December, 22:32
    0
    -3n + 18

    Step-by-step explanation:

    an = dn + (a - d)

    The difference is - 3.

    The first term is 15.

    an = - 3n + (15 - (-3))

    an = - 3n + 15 + 3

    an = - 3n + 18
  2. 3 December, 22:38
    0
    aₙ = 18 - 3n

    Step-by-step explanation:

    15, 12, 9, 6

    Given AP with first term = 15 and common difference = - 3

    aₙ=a₁ + (n-1) d = 15 + (n-1) * (-3) = 15 - 3n+3 = 18-3n

    aₙ = 18 - 3n
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