Question

Count the left-handed and right-handed spirals on the cacti in the photograph.

You should get two consecutive terms of the Fibonacci sequence. What are
the numbers?
A. 34 and 55
B. 5and 8
C. 21 and 34
D. 13 and 21
E. 8 and 13

Answer 1

2 = 1 + 1

3 = 2 + 1

5 = 3 + 2

8 = 5 + 3

13 = 8 + 5

21 = 13 + 8.

Fibonacci numbers are found in many structures in nature.

We have just found that these cacti enclose Fibonacci numbers 13 and 21.

13 and 21

Explanation: