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3 years ago

6

Given the sequence an defined recursively below, find a4. a1a2an=1=4=2an−1+an−2

1 answer:

const2013 [10]3 years ago

6 0

Answer:

$a_4=22$

Step-by-step explanation:

Maybe you have ...

$a_1=1\\a_2=4\\a_n=2a_{n-1}+a_{n-2}$

Then ...

$a_3=2\cdot 4+1=9\\\\a_4=2\cdot 9+4=22$

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