5,100,20,400, _ _ _ _ what numbers follow ,what is the rule,also what type of number sequence is it,many thanks elliott age 9.
Last edited by finfish; May 8th 2007 at 09:43 AM. Reason: explaining question.
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Originally Posted by finfish what type of number sequence ,5,100,20,400 many thanks well, it's not arithmetic since there is no common difference it's not geometric since there is no common ratio chances are it's a recursive sequence. here is what it is: the sequence is defined recursively as follows: a_1 = 5, a_2 = 100, a_n = a_(n - 2) * 4 for n >or=3
many thanks but i have worked it out , 5x4=20 100x4=400
Originally Posted by finfish many thanks but i have worked it out , 5x4=20 100x4=400 that does not define a sequence
Originally Posted by finfish 5,100,20,400, _ _ _ _ what numbers follow ,what is the rule,also what type of number sequence is it,many thanks elliott age 9. 5,100,20,400,80,1600 ------ the sequense is like this because 5*4=20,100*4=400,then 20*4=80and400*4=1600.and so on
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