Question
def a(n):
if n == 0:
return 0
elif n == 1:
return 1
else:
return a(n-1)+a(n-2)
for i in range(0,4):
print(a(i),end=" ")
a.
0 1 2 3
b.
An exception is thrown
c.
0 1 1 2 3
d.
0 1 1 2
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