Problem 7: Design a finite state machine that accepts all finite binary strings except those with some occurrence of "000" or "111" in them. (Optional challenge): Modify the finite state machine so it also accepts strings with both "000" and "111" in them.

8- Determine if each of the following recursive definition is a valid recursive definition of a function f from a set of non-negative integers. If f is well defined, find a formula for f(n) where n is non- negative and prove that your formula is valid. a. f(0) = 2,f(1) = 3, f(n) = f(n-1)-1 for n ≥ 2 b. f(0) = 1,f(1) = 2, f(n) = 2f (n-2) for n = 2

Write a dynamic programming solution to find the nth Fibonacci number.

Alice, a friend of Mr. Bernard’s, wants to compose a song. She asks Mr. Bernard for help. Although Mr. Barnard knows nothing about music, he finds that the sequence of notes in a numbered musical notation can be expressed as an FSM with input the alphabet {1, 2, 3, 4, 5, 6, 7} (“do”, “re”, “mi”, “fa”, “so”, “la”, “ti”). Alice wants to compose a song that contains the pattern “15” an even number of times. Please draw an FSM that only accepts a sequence of notes that satisfies the above pattern.   Note that you should provide a detailed description of the FSMs in your design to show how it works. Specifically, you should describe the meaning of each state.