If the nth term of a series is defined by $U_n = 2U_{n-1} - U_{n-2}$, and the first two terms are 1 and 2, find the sum of the next three terms.

University of Ilorin MTH101 ester past question

1. 3 + 4 + 5
2. 4 + 5 + 6
3. 5 + 6 + 7
4. 6 + 7 + 8

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