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the third and fourth terms of the sequence are 21 and 38. If the second differences are a constant 2, what are the first five terms of the sequence?

  • math -

    The 1st difference between terms 3 and 4 is 17
    The differences and the sequence are thus

    2 2 2 2 2 2 2 ...
    13 15 17 19 21 23 ...
    -7 6 21 38 57 78 101 ...

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