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Find a recursive rule for the sequence 2 4 6 10

User Nuway
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\bf 2~~,~~4~~,~~\stackrel{2+4}{6}~~,~~\stackrel{4+6}{10} ~\hfill \stackrel{n^(th)\textit{ value is the sum of the two before it}}{a_n=a_(n-2)+a_(n-1)} \\\\\\ ~\hspace{34em}

User Lilgodwin
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