Guest Posted November 29, 2010 Report Share Posted November 29, 2010 (edited) What is the next number of the series 1,9, 18, 25, 27, 21, ? Edited November 29, 2010 by yorsapat Quote Link to comment Share on other sites More sharing options...
0 araver Posted November 29, 2010 Report Share Posted November 29, 2010 (edited) First, see my post about posting homework. If this is the case, let me give you a hint: most of these problems can be found analyzing how fast your sequence grows i.e. by analyzing differences in consecutive numbers. E.g. if you see 1,2,4,7 with differences 2-1=1, 4-2=2, 7-4=3 you get how the sequence grows as 1,2,3 is easy to predict. Another example: if you see 1,2,6,15 with differences 2-1=1, 6-2=4, 15-6=9 you get that the sequence grows with square numbers (1,4,9). Again, it is easier to predict the difference sequence, rather than the original one. So, have you tried analyzing the differences of this sequence? Edited November 29, 2010 by araver Quote Link to comment Share on other sites More sharing options...
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What is the next number of the series
1,9, 18, 25, 27, 21, ?
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