Math Puzzle – Sequence Problem

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Find the next term of the sequence : 1,3,6,11,20..

[Original question by Ahmed Moustafa]

[spoiler](2^n)+n
Alternatively, you could also notice that the difference of the difference of the terms are in GP [/spoiler]

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Founder at Durofy. Blogs on technology & startups, runs a full service digital agency, teaches AP Calculus.

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