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Math Help - Find next two terms...

  1. #1
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    Find next two terms...

    -5,3,-2,1,-1,0,__,__?
    360,180,120,90,__,__?

    thanks
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  2. #2
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    Re: Find next two terms...

    Quote Originally Posted by mathDad View Post
    -5,3,-2,1,-1,0,__,__?
    360,180,120,90,__,__?
    what I see ...

    1st sequence, note the differences:

    8, 5, 3, 2, 1 ... looks like a Fibonacci sequence backwards with alternating signs.


    2nd sequence:

    (1)360, (1/2)360, (1/3)360, (1/4)360, ...


    these are just sequences the author came up with so that you could play the "guess what I had in mind" game ... imho.
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  3. #3
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    Re: Find next two terms...

    Quote Originally Posted by skeeter View Post
    what I see ...

    1st sequence, note the differences:

    8, 5, 3, 2, 1 ... looks like a Fibonacci sequence backwards with alternating signs.


    2nd sequence:

    (1)360, (1/2)360, (1/3)360, (1/4)360, ...


    these are just sequences the author came up with so that you could play the "guess what I had in mind" game ... imho.
    Thanks, skeeter. I *still* don't see the next two terms for the first sequence, though. Any more help? (my son's test is tomorrow, these are practice questions).
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  4. #4
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    Re: Find next two terms...

    look at the first "sequence" backwards ...

    0, -1, 1 , -2, 3 , -5

    ignore the signs for a moment ...

    0, 1, 1, 2, 3, 5

    except for the first two terms, each subsequent term is the sum of the two prior terms, then the signs were made to alternate.

    to tell you the truth, I sort of believe the sequence "pivots" at 0 and just runs in the same manner with alternating signs

    -5,3,-2,1,-1,0, 1, -1, 2, -3, 5 ...


    as I stated earlier, this is not a mathematical sequence ... it's a "guess what I did" exercise.
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