Question: (Combinatorics ) Please answer both questions! 3. find a recurrence relation for the number of the n-digit ternary (0,1,2) in which no 1 appears any
(Combinatorics )

Please answer both questions!
3. find a recurrence relation for the number of the n-digit ternary (0,1,2) in which no 1 appears any where to the right of a 2. 4. Solve the recurrence relation an = an-2, ao = al = 1
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