The numbers x, y, and z are in a Fibonacci-type sequence. If z equals x+y, use deductive reasoning to find all triples x, y, and z that make an arithmetic sequence as well as consecutive terms in a Fibonacci-type sequence. Assume that x, y, and z are the first 3 ordered terms in a Fibonacci-type sequence and in an arithmetic. sequence.
The difference between the first two terms in the sequence is...?
(as they are in a Fibonacci type sequence)
Also, as they are in an arithmetic sequence, we must have (their difference is constant)
So that
Substituting in we get
And so we have
Therefore, we have
The difference between the first two terms in the sequence is (the first term itself)
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