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10 October, 15:38

If the sixth term of a sequence is 128 and the common ratio is 2, then what is the first term?

1

2

4

+1
Answers (1)
  1. 10 October, 15:51
    0
    Geometric progresión:

    we can calculate any term, using this rule:

    an=a₁*r^ (n-1)

    a₁=the first term

    r=the common ratio

    a₆=128

    r=2

    an=a₁ * r^ (n-1)

    128=a₁ * 2⁶⁻¹

    128=a₁ * 2⁵

    128=a₁ * 32

    a₁=128/32=4

    Solution: a₁=4
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