Problem statement is not clear

#1

Please explain problem statement

#2

Class Assignment can help you understanding the problem.

for eg. a and b are some digits, say n=3
how many 3 digits number you can form with a and b, without consecutive b’s
ans: aaa, aab, aba, baa, bab… total 5.

solution hint: related to fibonacci series.

thanks

#3

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