Question: A string that contains only 0 s , 1 s , and 2 s is called a ternary string. a . How many ternary strings

A string that contains only 0s,1s, and 2s is called a ternary string.
a. How many ternary strings of length 4 do not contain two consecutive Os? Solve this counting two ways: one using recursion and one without.
b. How many ternary strings of length 7 do not contain two consecutive Os?
How many ternary strings of length 7 contain an even number of 0 s? Solve this counting two ways: one using recursion and one without.
A string that contains only 0s,1s, and 2s is called a

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