Question 1124924
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Why do you "need" this?  It is not mathematics; it is a riddle.  Either you see the answer or you don't.<br>
Actually, mathematically, there is no way to know "the" answer to this, or to ANY similar problem.  You could put any number next (or even something that is not even a number!) and it would be a valid sequence.<br>
I recognize this one as one I have seen many times.....<br>
Try writing out (in words, that is) the numbers 1 through 10 and see how that relates to your sequence.