AIR MATH

Math Question

There are 13 left-handed and 21 right-handed spirals on the cacti in the photograph. What is special about these numbers? A. The value of the 21 st term of the Fibonacci sequence is \( 13 . \) B. They are consecutive terms in the Fibonacci sequence. C. They are consecutive terms in the pyramidal sequence. D. The value of the \( 21 \mathrm{st} \) term of the pyramidal sequence is \( 13 . \)

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