We have the sum of n terms of a string given as 5n^2+6n

Now 5n^2+6n = 5n^2 + 5n + n

=> 5n(n+1) + n

=> 10n(n+1)/2 +n

Now 10*n(+1)/2 is the sum of n terms of the form n multiplied by 10 and n is the sum of n terms equal to 1.

**Therefore the general term has the form 10n +1.**

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