Sriman Dutta Posted October 4, 2016 Share Posted October 4, 2016 Hello everyone, I have got here the following series - 0,4,18,48,100,? So what's the next number ? 1 Link to comment Share on other sites More sharing options...
Sriman Dutta Posted October 5, 2016 Author Share Posted October 5, 2016 can nobody solve this? Link to comment Share on other sites More sharing options...
timo Posted October 5, 2016 Share Posted October 5, 2016 I say it's either 6*6*5 or 42. Probably 42. Link to comment Share on other sites More sharing options...
Sriman Dutta Posted October 6, 2016 Author Share Posted October 6, 2016 logic? Link to comment Share on other sites More sharing options...
Daecon Posted October 6, 2016 Share Posted October 6, 2016 (edited) 0*1*1=0 1*2*2=4 2*3*3=18 3*4*4=48 4*5*5=100 5*6*6=180 Edited October 6, 2016 by Daecon 2 Link to comment Share on other sites More sharing options...
Sriman Dutta Posted October 6, 2016 Author Share Posted October 6, 2016 Right Daecon. The missing numbers is 180 indeed. Although my logic was different. 1^3-1^2=0 2^3-2^2=4 3^3-3^2=18 4^3-4^2=48 5^3-5^2=100 6^3-6^2=180 It's interesting that a single problem can have multiple solutions...... Link to comment Share on other sites More sharing options...
timo Posted October 6, 2016 Share Posted October 6, 2016 x³ - x² = x²(x-1) = x*x*(x-1). Link to comment Share on other sites More sharing options...
AshBox Posted December 19, 2016 Share Posted December 19, 2016 (edited) If n = 11 x (1+1)²1 x 2²=4 << First number of the sequnceIf n = 22 x (2+1)²2 x 3²=18 << Second number of the sequence and so on.. The Next Number is 180. Edited December 19, 2016 by AshBox Link to comment Share on other sites More sharing options...
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