Theory algorithms question:

All questions in this homework use the alphabet (a,b} Question 1. Define Li-fu, e * : w does not contain two consecutive bs). a. How many strings in L1 have length 0? b. How many strings in Li have length 1: c. How many strings in Li have length 2 d. How many strings in Li have length 3? e. How many strings in Li have length 4