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9 December, 09:03

What is the 16th term of the following geometric sequence? 5, - 10, 20, - 40, 80, ...

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  1. 9 December, 09:24
    0
    The pattern in this sequence is * - 2

    so

    80 is the 5th number

    -160, 320, - 640, 1280, - 2560, 5120, - 10240, 2048, - 40960, 81920, - 163840

    The 16th number of this sequence is - 163,840
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