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A ternary string is a sequence of 0's, 1's and 2's. Just like a bit string, but with three symbols. Let's call a ternary string good provided it never contains a 2 followed immediately by a O. Let be the number of good strings of length n. For example, G₁ = 3. and G₂ = 8(since of the 9 ternary strings of length 2, only one is not good).Find, with justification, a recursive formula for , and use it to compute G₅.

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A ternary string is a sequence of 0's, 1's and 2's. Just like a bit string, but with three symbols....
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