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12 February, 09:38

What is the 7th term of the geometric sequence 4, - 20, 100

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  1. 12 February, 09:47
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    1st let's calculate r the common ratio:

    r = (-20) / 4 = (100/-20) = - 5

    Value of nth term = a₁. rⁿ⁻¹, where a₁ = 1st term and n, the rank

    Value of nth term = 4r (⁷⁻¹) = 4. (-5) ⁶

    Value of nth term = 62,500
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