26, 15, 41, 56, 97, 153, 250, 403, 653
Which type of sequence is this?
A.) the Fibonacci sequence
B.) Multiplying by 2
C.) Geometric Sequence
D.) Harmonic Sequence
This sequence is neither the Fibonacci sequence nor the Harmonic sequence.
It is also not a simple case of multiplying by 2, as the differences between subsequent terms are not constant.
However, notice that the ratios between subsequent terms get progressively closer to the same value - specifically, the ratio is approaching the Golden Ratio of 1.618.
Therefore, this is a Geometric Sequence with a common ratio of approximately 1.618.