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Fibonacci might have been here

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The sequence S1, S2, S3, ... , S10 has the property that every term after the second is the sum of the previous two.

That is, Sn = Sn-2 + Sn-1 for n > 2.

Suppose that S9 = 110 and S7 = 42.

What is S4?

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Fun

s4 = 10.



solve s8 as s9-s7. then flow back from there as s6=s8-s7 and so forth. s1 was 2 and s2 was 4.
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