Math

posted by Max

Calculate the missing terms of the geometric sequence ..., 2048, ?, ?, ?, 8, ... Select all that apply.

1,538, 1,028, 518 *****
1,534, 1,020, 514
512, 128, 32
-512, 128, -32
-1,534, 1,020, -514
-1,538, 1,028, -518

I have to pick 2 options. I know the first one is correct, but I don't know how to get another option. Please help? Thanks

  1. bobpursley

    you are given a2, a6.

    a6=8=2048r^4
    r^4=8/2048=
    r=+-1/4
    2048,512,128,32,8,2....
    or r could be -1/4
    2048,-512,128,-32,8,-2....
    so two answers are right.
    r=
    2048*1/251=

  2. Max

    That's interesting, I was super wrong 0_0 I guess its the middle two...
    Wait, is this because this is geometric and not arithmetic? Because I got answer a through adding and doing the mean thing... is that where I went wrong?

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