(Choose 1 answer)
(See picture)
A. None of the other choices is correct
B. 18
C. 24
D. 21
E. 15
Suppose that the number of ways to solve an n-piece puzzle satisfies the recurrence relation
fnfn-2+nfn-3
with the initial conditions
f₁=1, f22, f=3.
How many ways are there to solve a 6-piece puzzle of this kind?
Et 45
