## anonymous one year ago Find a recursive rule for the sequence 2, 4, 6, 10, …

1. myininaya

hint: 2+4=? 4+6=?

2. myininaya

can you find those sums?

3. anonymous

the thing i dont understand is how the formula looks. im not very good at math. and ive never learned how to do recursive formulas.

4. myininaya

well can you find the sums mentioned above?

5. myininaya

2+4=? 4+6=?

6. myininaya

do you notice that you find a term by adding it's previous two terms for this sequence ?

7. myininaya

$a_1,a_2,a_3,a_4,\cdots \\ \text{ we seen the following if you found the sums I asked you to above } \\ a_1+a_2=a_3 \\ a_2+a_3=a_4$

8. myininaya

$\text{ so say we want to find } a_n \text{ and we know the previous two terms are } \\ a_{n-1} \text{ and } a_{n-2}$ $\text{ could you write what } a_n \text{ would be }$