Class assignment

#1

i didn’t understood how the output came

#2

You are given two numbers say a and b, and a number n specifying the number of digits of the number to be formed. The rule is to not have consecutive b’s, you can do alternate a’s and b’s or consecutive a’s.
For example, for n=1, 2 possibilities i.e. a and b
for n=2, 3 possibilities i.e. aa, ab, ba.
for n=3, 4 possibilities i.e. aaa, aba, aab, bab, baa.

#3

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