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Tuesday, February 23, 2010

Next number please:

1 - 2 - 6 - 30 - 60 - 180 - 900 - 1,800 - 5,400 - ?

Miguel Tato said...: 5,400 * 5 = 27,000; February 23, 2010 5:26 AM
Zaux said...: hi Miguel ...
you are right ... the repeating pattern is 2,3,5 as multipiers; February 23, 2010 5:35 AM
Ragknot said...: Ross,

No one solved this problem, but you were close. I have added a picture with the correct solution.

http://trickofmind.com/2010/02/ag-engineering-problem.html; February 23, 2010 5:40 AM
Neal said...: Hooray, I figured this one out (according to the author); February 23, 2010 8:28 AM
Gr1tz582 said...: Lol i figured this one out pretty quick; February 23, 2010 8:30 AM
Ross said...: This is incorrect! The next number is 5495; these are the roots of the well-known Ross's Function:

x^10-13874*x^9+64522955*x^8-114983459662*x^7+76595446300380*x^6-15440815654777800*x^5+
1031279866060788000*x^4-23943310627869360000*x^3+158288803272936000000*x^2-
322258579056000000000*x+186897170880000000000

Or, in factored form:

(x-1)*(x-2)*(x-6)*(x-30)*(x-60)*(x-180)*(x-900)*(x-1800)*(x-5400)*(x-5495)

(This is a joke, but only sort of); February 23, 2010 9:20 AM