Odd- and Even-numbered Terms

Algebra Level 3

Let a1,a2,a3,a2n,a2n+1a_1, a_2, a_3, \ldots a_{2n}, a_{2n+1} be an arithmetic progression. If the sum of all the odd-numbered terms is 130130 and the sum of all the even-numbered terms is 117,117, what is 2n+1?2n+1?

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