On 10/26/2005 4:39:39 PM, Tom_Gutman wrote:
>There is no fully general
>method. Much depends on the
>particular series. But a
>useful place to start is to
>calculate the differences:
>
>6, 25, 56, 99, 154
>
>19, 31, 43, 55
>
>12, 12, 12
>
>The second differences are
>constant, so the numbers can
>be represented by a quadratic
>equation. But there is no
>need to actually work out the
>quadratic -- the table of
>differences can be extended by
>adding a fourth second
>difference of 12:
>
>6, 25, 56, 99, 154, 221
>
>19, 31, 43, 55, 67
>
>12, 12, 12, 12
>
>
>� � � � Tom Gutman