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I have a problem with sequences and series. Can anybody help, please?

The question is

For the sequence U1, U2, U3, ....Un... the terms are related by

Un = Un-1 +2Un-2

where n is greater or equal to 1, U1=2 and U2 =5.

Find the values of U7, U11, and U14.

Can someone explain to me how to do it?

Thanks!!

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# Homework Help: Sequences and Series problem

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